Sitting 3 meters back from a 42 inch screen as I do, stuff like Ace Combat 7 on Switch at 720p still looks fine.
Image treatment is a major factor though; AC7 is relatively clean without a lot of post-processing and such, whereas games that throw around a lot of post-processing tend to look blurrier at the same pixel count, so there's more to image quality than just resolution.
4K is a waste of resources in my opinion, for consoles anyway, when 1440p and even a well treated 1080p still look good enough in my opinion.







