I used to own a Steam Deck, and one of my biggest annoyances was how often games had black bars. It was just really annoying for a device with already large bezels. But any time someone makes a post about it, people are passive aggressive a holes that offer nothing of value and just say the games they play work fine, or “get over it”, or 16:10 is standard for pc. Good for you, but then tell that to the countless number of games with no proper 16:10 support. Every game I know of has a natural 16:9 ratio but that is not the case for 16:10. Needing to mod in 16:10 support for many games just proves the point. It just baffles me how angry and passive aggressive people in this sub are when someone makes any complaint about 16:10. At least you can stretch now but that kinda sucks.
I would say that putting a 16:10 on SD was really clever decision from Valve. It solves a lot of issues. It looks better when natively supported, it looks better when running anything 4:3. It feels fine running anything 16:9.
More than that. Since SteamOS 3.5 it finally becomes possible to stretch the screen so you can fill the black bars. And here’s the thing: you can run games on 4:3 resolutions, stretch them to remove black bars and use FSR. While you think that it’d look weird, thanks to screen being 16:10 it will actually look better than you’d expect. As an advantage: better battery life and performance