yes but you have settings that gives you a very high quality image at first sight, and you have settings that you need a magnifying glass and 30sec of staring to spot a difference.
as many others explained, you can get max image quality or extremly close to it , without throwing away performance in useless settings.
therefor you dont need 300% increase of flagship perf to have playable 4k, a 2x390 would be plenty enough.
Every ones visual experience and priorities are different.
You can not tell me what I don't need any more than I can tell you what you do need.
What is can do is state what hardware is needed to use all the settings in a game to the max, that does not mean that you or any other end user should use those settings.