Well, take a note from Mario tennis in this regard. You can play with buttons or with motion control. Not everything works the same, so the modes are separated, but I can play both ways. Why not add a Pro controller mode, that says: yes you can use Pro controller, but that means you can only play 30 of the 80 games. This shouldn't be a big problem, because they already limit the minigames in online.

I have a Switch and recently picked of Mario Party. Being forced to use a single joycon as a controller is by far the worst part of a game. It's terrible, and worse of all, there's no reason why they couldn't add support for pro controllers, or the dual joycon controllers, even if that meant limiting some of the minigames. I mean, they made several minigames that require two switches that 95% of mario party players will never play, why not allow users to choose their control scheme? Why not allow users to play in handheld mode. If the motion controls work for Splatoon and Zelda, they can be made to work for mario party.

Most of the game, including unlocking the hidden characters, requires game modes that favor single player play. There's about 7 or 8 game modes, only one of which is traditional mario party. Sure, you could get a friend or two to do them with you, but it's certainly not necessary. So I'm having a Mario party party in a  few weeks. I want to unlock all the characters before the party, and my wife couldn't care less about video games which leaves me playing by my lonesome most of the time. Before now I did most of my Switch playing in handheld mode, often times in bed before I went to sleep. I can't do that with Mario party. Ohh no. Now I'm forced to use tabletop mode (which is frankly terrible) or tv mode, and using individual joycons for no good reason. It sucks, and it's annoying because its completely unnecessary.

handheld mode or burst for me. i dont really care about mario party, but its terribad about making the user take the joy cons off to play, fuck that with any game.

Because Controls should service the experience, which will service the player naturally. Games like Mario Kart have control options because it benefits the experience, as the game is simple to work with any controller. Super Mario Party has an experience that needs a more locked down control options. It's not because they hate your pro controllers, it's because its what the experience needs. 

What about the experience requires the use of joycons?

The control scheme of Mario Party is actually less complicated than Mario Kart.

Several Minigames require the Joy-Con be used in a specific position. These kinds of games work better with the Joy-Con than the Pro Controller since its easy to use a Joy-Con like a handle, or a Baseball bat. Unlike Mario Kart, Mario Party never keeps you doing the same thing for too long, there's a variety of activities each with a different control scheme. Mario Kart is easy to adapt to other controllers because it's just one simple control scheme. Mario Party has multiple activities that require different things. 

It's how the game was designed fundamentally. 

Your post is kind of a contradiction as you say it never hurts to give options yet go on to say one of the consoles with the most options is where things were the worst.

Also, CoD on Wii U, as far as the controls are concerned, was excellent. I still play Black Ops 2 on Wii U to this day.

So I can't rotate a pro controller or the switch in handheld mode like I did in Breath of the WIld to solve all of those temple puzzles? It works perfectly fine. I can take a pro controller or a two joy cons in a base, hold it vertically, and periodically press a trigger button just as well as I can on a Joy con. It's not exactly difficult.

And again, the Mario Kart control scheme is far more complicated than any Mario Party mini game. Most of them involve either one thumb stick or motion control. They have tutorials and practice times before every single minigame. People can practice just as well with a pro controller to get the right orientation and practice the necessary motions as they can with a joy con.

it's not how the game was designed fundamentally. I've been playing Mario Party games for over 2 decades. That's complete nonsense. This is the Breath of the Wild Weapon durability apologist approach all over again. Nintendo just decided they would dictate how people would play their game, and put barriers to prevent gamers from playing it in any other way than they way Nintendo decided it should be played.

I see myself seldom agree with you, but here we are. In Mario Tennis they have a Swing mode, there you can use motion controls for the game. It limits the modes you can use - but you still can use it. Offering a handheld mode or Pro controller mode and including only some of the games would have been completely fine. In my opinion a dumb decision, to limit the game.