No it doesnt take, you dont have rule for that and nothing is certain, only thats certain is that PS4/XB1 games will have downgraded graphics on Switch, if game will have lower FPS, or some content cuted, that really depends from developers priorities with port, if devs want they can only have just downgraded  graphics.

But when you porting game from two similar platforms to completely different platform, with different power, different tech and architecture, different concept... of course that port will be slightly different, ofcourse that not everything will be exatly 1:1. But offocurse doesn't mean that Doom for Switch is a different game, its still same game despite those "slight" differences, its still a Doom 2016. game. DIfferent game and port are not same things, and Doom is of course port not different game.

Thats not true, that list does not prove that CoD Wii games were not ports from PS3/Xbox 360, that list just show differences between Wii ports compared to PS3/Xbox 360 version of games. Now you dont make any sense, Switch Doom is port of 2016. Doom game, and Doom 2016. is rebot of first Doom. CoDs for Wii offcourse are not rebot from PS3/Xbox360 CoDs games, they are ports. From your link: "The Wii is a console manufactured by Nintendo. In the Call of Duty community, it is noted for its versions of the games being inferior".

CoD BoD is a different game, buy Wii CoDs are PS3/Xbox 360 ports that are adapted to Wii hardware, controls, internet capabilities...

Super Smash Bros Switch Port
Bayonetta 1&2 Switch Port
Bayonetta 3 (E3 announcement)
Madden
Persona 5 Switch
Kingdom Hearts 3 (E3 announcement)
Telltale Games Switch (E3 announcement)
Donkey Kong Country Switch (E3 announcement)
Star Fox Switch (E3 annoucement)
Mario Party Switch (E3 annoucement)

At least one major annoucement of an exclusive from Square Enix.

I don't have to be certain, the majority of 30FPS console titles that do get ported to the Switch will come with either cuts to content or mechanics ... (we see this all the time even in multiplatform games within the same generation and the Switch won't be able to run every content even if graphics are downgraded) 

Switch and PS4 are two different platforms no matter what you say ... (both have different architecture and far more different performance tiers) 

Doom on Switch is a slightly different game since it doesn't feature the level editor, that's a fact not an opinion ... 

CoD on the Wii were arguably entirely different games to the HD twins. No killcams, 10 player lobby sizes, no ground war modes, limited private match customization, no DLC map packs, no split screen, and no third person camera across all games. CoD 3 didn't have any multiplayer on Wii, there's no zombies, Co-op, less maps/levels in CoD WaW on Wii, CoD MW/BO on the Wii has tons of missing/dfferent mechanics/content ... 

It's not only inferior, CoD for Wii may as well be a different game ... 

CoD BOD is intentionally a different game whereas CoD on Wii may as well not be the same games as the HD twins ... 

There's almost no way for Switch to run AAA 30FPS console titles without changes to content or mechanics ... 

All of that is besides the point. Are you willing to deal cut content or different gameplay mechanics if 30FPS AAA games do come to the Switch ? (possibly worse than losing level editor in Doom or journey mode in FIFA 18) 

We didnt had any cutted mechanic with any game until now, content is always possible because you have lotsa content thats not important (like level editor) and we seeing that devs want to have smaller cartridges for their games.

Lol, but my point is that they are two difrent platforms (completely different platform, with different power, different tech and architecture, different concept...), so of course that you want have exactly same game running on PS4 and Switch, so Of Course they are some differences to Switch version of Doom compared to PS4 version of Doom, but that's still same Doom game not different game.

You have YouTube link with comparison of PS3/Xbox 360 and Wii versions of game, you can see that still same CoD game (not different CoD game) despite differences.

Again, CoD BOD is different game, it's not port of any other game, so doesn't have anything with Wii CoD games that are ports.

Of Course that Switch can run any 3rd party game without changed to content or "mechanics" (we still don't have any cutted mechanic), all comes to priorities of devs. Only reason why Fifa 18 dont have Journey Mode is because is using different engine and EA said that Switch could run same engine but it would be more downgraded compared to PS4/XB1 versions of game, and they think that custom Fifa is better choice for Switch(thats why we have 1080p/60fps), so if the wanted they could make run Switch at Frostibite Engine and game would have Journey Mode. If Bethesda really wanted they could include level editor also, but that's not important at all, it's definitely more important multiplayer.

That is opinion ... 

That's some mighty strong congitive dissonance right there ... 

The campaigns look like they're the same at first but once you go to multiplayer there are irreconcilable differences between them ... 

Of course CoD BOD is a different game. The developers made it intentionally so but CoD for Wii are not straight ports, in some ways one could call them a reimagining on limited hardware ... 

You've been dodging my question this whole entire time ... (my basis is not around 'will' but it is 'if')

If KH3, FFXV or MHW does come to the Switch can Switch owners deal with the possibility having changed content or mechanics ?

That opinion based on reactions of people, nobody cares about level editor for Doom, nobody really mentioned that at all, while people did mentioned Journey Mode for Fifa.

You really need to learn difference between port and different game, Doom for Switch is offcourse port of PC/PS4/XB1 Doom game, its not difrent game.

Yes, they are differences in multiplayer for obvious reasons, like Wii internet capabilities.

Offcourse that CoDs for Wii are not 1:1 ports (straight port) from PS3/Xbox360 and that there will be some difrences. 

I really didn't realize that's a question, people don't care about level editor for Doom, and while they said it's bad because Switch version of Fifa will not have Journey Mode, most people that were wanted to buy Fifa for Switch said its not deal breaker. Again, downgraded graphics is certain thing, lower FPS and changed content are possibilities (because you have lotsa content that's not important like level editor and we seeing that devs want to have smaller cartridges for their games), and we yet to see Switch game that has changed mechanics. We cant relly say how people will react for evre future port, because evre port is different, but if they want to play ports of AAA games in full handheld mode or on only on Switch in TV mode, they will not have choice.