For a 27" monitor the perfect resolution seems to be about 5K and just aren't really any other options on the market for a 27" 5K screen other than an iMac right now.
If you want a decent screen for text work it's probably not a bad idea to buy a used iMac and work out how to display text on it but it's not a clean solution.
e.g. I could personally use tmux running on the iMac or something but it's messy.
It seems to a shame to needlessly generate eWaste when there's not really a better screen on the market new.
I don't get his height adjustment argument. It's a pain in the arse but you can pretty easily buy a VESA adapter for an iMac and a height adjustable arm off the shelf.