I understand, but when you spend over £1000 for a TV then you buy a cheap £20 -£30 wall mount for it?, Anyway its his choice in the end
its the same when people who buy a 3080 card and on use it for a 1080p gaming for example, if you’ve got an RTX 2080/3080 card and DLSS turned on while connected to a 1080p Full HD monitor you won’t notice a difference. And DLSS improves performance though from rtx in titles that support it, that's the only reason rtx is worth it. Otherwise you're better off with a 1080 Ti, if u can find one but DLSS lowers texture resolution, then upscales it in order to solve some of the performance drops with DXR
There's no logical reason to use a 2080/3080 for 1080p when it's made for 4K or multiple 1440p monitors.