The Switch actually is much more powerful than it seems, but Nintendo scales it back, and then game devs also scale back their games just so it can save on battery life.
The "new" Nintendo Switch with the more efficient processor and still the meager 16WHr battery can last 4-5 hours playing Fortnite. An iPad Pro with 36WHr battery (more than twice the capacity) lasts just about as much regardless of what settings you try. If you push it hard to 120fps (at roughly the same settings as the Switch, actually), that figure drops even more significantly.
There's a reason I only game "seriously" on my Switch, and my iPad Pro is mostly a media consumption device.
Also the Xbox One S was the worst-performing console of the last generation. It's barely able to do 30fps at 900p (not even 1080p) in most games, so I'm not sure you'd want to use that as a point of comparison.
On the other hand, the Xbox Series X, the most powerful of the last generation, can dish out 4K 60fps in quite a few games. And my 16" MacBook Pro is just barely below that console. That's the hurdle Apple will have to jump over if they want to convince me I need a 16" MacBook with Apple Silicon.
And it looks like Big Sur already hinted at an answer:
Listed plainly and clearly within macOS code is the number of compute units each GPU will have: Navi 21 will have 80, Navi 22 will have 40,...
www.techspot.com
Makes no sense to include new AMD drivers if Apple wanted to go all-in with their own chips. Sounds like one of the below scenarios can happen to me:
1. There will still be Intel Macs coming... and some of them will use AMD RX6000 series chips.
2. AMD is developing drivers specifically for Apple Silicon.
And in either of those cases, it's clear to me that even Apple themselves are not confident they can overcome the GPU performance hurdle so soon. And that sounds more realistic than claims that Apple Silicon will completely blow both Intel and AMD away.