I just purchased an HP Z27 (4K 27”) because I couldn’t deal with the low-res monitors I had at home. The high quality monitors in my office had really spoiled me.
It has become a challange to have a sane default for text rendering. Many users are still on really bad LCD monitors with low contrast. Macbooks also does 2x scaling. On a 4k monitor on PC i recommend fractional scaling eg 1.5 but as an app dev you cant control that. So do you increase text size to make up for the small pixels, or do you leave that up to the user.