As a retro gamer, it seems to me so limiting to not be able to play or enjoy games below thresholds that only current systems can reliably achieve.
I can't imagine not being able to go back and have a ball with F-Zero GX on Gamecube, Mario Galaxy on Wii, or Star Wars Battlefront on Xbox because they're sub-HD, much less not even being able to play PS3, 360, Wii U, or many Switch games cos they're 720p.