So when are High-Res displays going to get smaller?

Btw, even with your glasses-corrected vision, viewing the currently-available 30" 3840x2160 monitors from the minimum recommended 76cm distance (same as the diagonal size), the resolution would still be an overkill. You would need a 20/15.6 vision to match the sharpness. Or move closer from the recommended minimum distance.

Actually, if following the rule of thumb of using the same figure for both distance and diagonal size (meaning using 24"=61cm distance for a 24" monitor, and so forth), we can calculate the max resolutions for different vision acuities:
20/15: 4000x2250
20/20: 3000x1690
20/25: 2400x1350
20/30: 2000x1120
20/35: 1710x960
20/40: 1500x840

Ps. For reference, 20/40 (or 6/12 or 0.5) is the requirement for legally driving a car (at least here in Finland).
 
People don't buy higher resolution displays to then sit further away from them.

What is this madness? I sit about 50-60cm away from my 27" monitors and at that viewing distance there is a very distinctive difference between the sharpness of my phone's display (5.5"@1280x720) placed against my monitor, ie viewed at the same distance, not relative distance.

So much so that my 27" 2560x1440 monitors look like arse in terms of sharpness compared to my phone display.

My eyesight isn't particularly good at all, though I am short sighted with astigmatism. So really, 4k on a 30" monitor would look great compared to other monitors but it would still be lacking.
 
The recommended distance "madness" comes from the fact that
1) if you go too close (relatively), you'll have to start physically moving/tilting your head to change the part you're watching at
2) your eyes are good for focusing on the middle, unfortunately your peripheral vision isn't as attentive

This one isn't actually an official factor, but will come into play in any case: IPS glow, VA gamma shift, TN's weak viewing angles, (might be others, not sure what PLS does, apparently similar to IPS...?)

I didn't even yet mention the recommended distance for movie watching, which is 1.5-2.0x the diagonal, IIRC.

So yes, there are indeed logical reasons for not sitting too close to the monitor.

If you're forgiving any one aspect, it just means you're making compromises to accommodate some other feature. Which I won't say is a wrong thing to do, because different people value different things.

edit:
Furthermore, your phone has a PPI of 267. So it's only natural that it looks sharper from the same distance, if you're comparing it to a 27" @2560x1440, with a PPI of 109...
 
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