I was just giving my opinion. AC3, DbD, DQ XI, Senua, all looked blurry, or had huge framerate problems compared to PS4/XBO. And those are just games from last Direct, there are other games that suffered a lot already on sale. So yes, most games that were meant to work on PS4/XBO look way worse on Switch is a fair "generalisation".
And no, 3rd party devs that will spent a lot of money and time making games for PS5/XB2 won't spent as much money, time and games on Switch, despite having a bigger install base. That didn't happen with Wii compared to PS3/X360 and it's not going to happen with Switch for obvious reasons. You forget too that those companies will still sell games on PS4 and XBO that will have an even bigger instal base than Switch. By the time they stop selling games on those consoles (and Switch has 70M sold like you said), PS5/XB2 will have enough install base combined to sell specific games for those consoles.
We are in 2019 and Capcom, Square Enix, EA, Activision, Bethesda, Ubisoft, etc have not announced a single exclusive AAA game for Switch. Some of them will make games for Switch of course, but those games won't help Switch to sell better, because they won't be the best games from those companies.
Switch is going to live and die on 1st party Nintendo games. 3rd party games and indies are just icing on the cake.
Square Enix has Octopath Traveller while Ubsoft made Mario&Rabbits: Kingdom Battle as exclusive games just from the top of my head . DQ XI S and Starlink: Battle of Atlas are both much bigger and more extensive on Switch which make the Switch versions by far the best one. Konami made Super Bomberman R a timed exclusive. And that's just out of my head and not counting Hyrule Warriors and Fire Emblem Warriors.
What games do PS4 or XBO have exclusive from these publishers?
The big publishers didn't invest very much into the Wii because their games didn't sell very well back then (safe for Just Dance). But with the Switch we constantly get news that sales of Switch versions exceed expectations, not just from Indies but also from the publishers. There's a reason why EA is reportedly porting the Frostbyte engine to the Switch: 3rd party games are selling well on Switch. It's not just Nintendo anymore, thought he high quality of their games sure helps.
Besides, these Publishers are all downshrinking to just a handful of IP (apart maybe Ubisoft and Square Enix, for now), so I'm sure neither the PS5 or the Xbox Next will get much 3rd party exclusives either, no matter how well they'll do.
Just banking on the publishers ain't worth it either, just have a look at the XBO. While third party games generate sales, the selection of first party and other (non-timed) exclusive games is getting more and more important again when choosing which console to buy. Without their slew of great first party titles, the PS4 wouldn't nearly have sold as well as it did.
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454