Author of the article here. I tried all macOS offered but it wasn't good on 32'' at 4k sadly
32" 2560x1440 displays have the same PPI as 24" 1920x1080 displays (92 PPI).
MacOS has flawless scaling since the first retina Macbook Pro. What you are describing makes no sense to me...
Also always connect via DisplayPort instead of HDMI if you can, safes a ton of trouble.