Actually a lot of games probably DO support 16:10, since apple has always pushed the format and a LOT of laptops are folling suit in recent years. its not like its hard to make a setting for 16:10....

as for the performace, remember that the switch's hardware, the launch model X1 chip, has raw performace capable of near 1.9GHz on the CPU and 1GHz on the GPU when the switch, due to wanting to run consistantly and without overheating, runs at a lower rate even while docked(1Ghz and 750Mhz), and around 60% of that on the GPU undocked, meaning that in portable mode the switch is only using around half the performace of the entire chip.

now while the steam dock might be more open, clock speeds might be BIOS limited.

Ergo, we honestly don't know the raw specs it will actually do before someone like digitalfoundery gets a hold of one.

Well, Steam at least uses Proton, so most of the games will be from Windows.

The only thing that Proton can't do is run recent Anti-cheat software like EAC.

Other than that, it's most likely that your favorite game will work fine, specially if it uses OGL/Vulkan.

AAIK, you also have the option to install W10/11.

I forgot just how beastly PS3's Cell processor was, to think that it beat all four Gen 8 consoles in raw flops, even though it was gen 7. But, it was also very hard to develop for, so few devs ever properly tapped into it. 360's processor was also slightly ahead of base XB1 and PS4, in raw flops. Gen 8 sure was a disappointment on CPU, so many developers were disappointed by Jaguar because of how much it limited development. I'm really glad that we saw a proper generational leap in CPU power on Gen 9.