To me it's all about desk size. A desk needs to be big enough to accommodate larger screens to where you can push it back to an acceptable viewing distance or bring it closer for whatever you're doing. Some desks aren't quite deep enough to comfortably sit a 32in screen on. If you got the real estate then it's definitely nicer to have bigger if you can afford it.
1800p 27in is 135ppi 5.76m pixels . . . 2160p 32in is 137ppi 8.30m pixels . . . 2160p 42in is 105ppi 48in is 92ppi . . . 1440p 27in is 108ppi 3.69m pixels
1800p 27in would not only be much easier to run but sit better on a smaller desk too.
My bad, I just wrote all that and realized I can't tell if you think they're a waste because of the size and resolution or something else but I'll leave it anyways. My only real problem with the OLED monitors was the matte finish, terrible choice, price didn't help either. I am a little concerned about the glass screens on the OLEDs from Dough. It'll look sharp but I'm worried about it chipping on the edges or something.