That’s missing the point. 5k at 28" is exactly double the standard HD resolution for a 28" monitor (2560x1440). So it’s the same as a normal 28" monitor, only everything is clearer. Not all of us want more information, we just want what we have to be easier to view.
And for games you can just drop to 2560x1440, get perfect 2x scaling and it looks great.