o1. Great Nintendo games
o2. Weaker than the PS4
o3. Better build quality
o4. Better motion controls
o5. 1080p screen
o6. $300 launch

For sure the PS5 and XBSX will have the mobile version of Ryzen 3000 in them minus the integrated GPU part. These are all 7nm monolithic dies for low power consumption, more expensive to make, but reasonable at lower core counts (Ryzen 3000 was architected for up to 64 cores being affordable). There's no 14nm IO die etc. in the mobile parts.

It only takes 2 Ryzen cores to beat the PS4's CPU, the PS5 will have 4x power with 8 cores. As for the GPU, the Ryzen mobile GPU is completely unrelated to the PS5's GPU.

Well Ryzen mobile 3000 is Zen+ isn't it? Ryzen mobile 4000 is Zen 2 which is confirmed for the consoles. 

In another thread and with more research, is seems like Ryzen mobile 4000 GPU's are tied to RDNA to some extent. How much exactly we'll eventually find out. While the RDNA design has ties to GCN still, it looks as though, and based on the naming, that Ryzen mobile 4000 is still mostly Vega and GCN at it's core.

While I don't see Nin ever having a GeForce based Switch then Radeon based Switch, it would be cool to see a new PS handheld/hybrid with this tech.

A portable chipset nearly outdoes the ps4 right now and switch 2 is going to use something better.

Yeah all that except #2. Switch 2 will certainly be stronger than the PS4, but 2023 is a more reasonable launch date. 2025 release date would probably mean any XBSeries/PS5 game could get ported to Switch 2. Which would be nice but they aren't gonna wait 8 years to release a new system.

Nintendo should handle Switch like they handled the Game Boy. Give it a long life as it's the only viable hybrid console for the foreseeable future, so competition isn't a worry.

More sequels, new games and even create new games for some dormant IPs.

Mario Odyssey 2
Splatoon 3
Mario Kart 9
Pokemon (D/P remakes, Gen 9)
2D Mario
2D Zelda
2D Metroid
Tomodachi Life
Pikmin 4
Animal Crossing spin-off
Splatoon spin-off

I could go on.

What about not waiting 8 years to release a new console is stupid? That would mean all the companies have always been stupid because the only system that has lasted 8 years or more before being replaced is game boy (and I'd argue it lasted that long only because GB had zero real competition but also portable gaming wasn't a huge thing until Pokemon hit and Nintendo realized handhelds could be huge business).

It WOULD however be pretty stupid to let Switch sales die off for a couple years while Nintendo sits on its hands without doing an easy direct sequel to the Switch.

Switch 2 Lite (portable-only):
- 2 tflops

Switch 2 Hybrid (portable/home):
- 2 tflops undocked
- 3/4 tflops docked

Switch 2 Tv (home-only):
- 6 tflops

By 2023/2024 those performance should be possible for an handheld / hybrid system.

What's the reason the Switch 1 and Switch 2 couldn't co-exist for multiple years?

Switch 2 is probably going to raise the price up to $349.99 to start as that's a more lucrative price position, something like the Switch Lite at least will be like $149.99-$169.99 by then ... they would be serving completely different parts of the market by then.

Nintendo is not going to abandon the upscale $300+ market, that part of the market makes a lot of money and that consumer buys a lot of games, you lose that upper end market to people who aren't 11 years old and eventually get tired of a very dated product to other game platforms if you don't keep your product line fresh. 

People are not stupid, they're not going to keep paying $300-$350 just for something that is a small upgrade indefinitely. New 3DS really didn't do that much for 3DS sales that type of an upgrade simply isn't very exciting. 

Those people in that price category (willing to spend $300-$400+) will spend that money most likely on PS5 or XBXS instead as those companies will aggressively court that audience's spending power. 

So yeah if you want just rinky dink kiddie audience that doesn't care for graphics fine, but you don't get to have it both ways and think you're not going to lose a lot of the higher end Switch demo that drove the install base in its first 3 years and simply gets tired of a very dated product. They're gonna start bailing out of the platform in 2022, 2023, no one's going to give that much of a shit that you're releasing like the 5th Mario platformer on the same dated hardware that was running Odyssey by that point. 

You can't have a boring party that's starting to fizzle out by 12:00 AM and ask people to stay until 3 AM when there's much more livelier party going on next door. People are going to want to leave.