I use dual 43" 4k TVs as monitors. It's fantastic.
For my money, I have 2x 1080p 24” displays, and a third curved 32" 1080p display which is hooked to a KVM so I can game on it.
I like the 3 monitor setup because they are all at angles from each other, approximating a huge curved display. Plus, this was a cheap setup off woot.com parts.
1600x1200 on a 21" CRT was king. though.
Also, old stuff lacks shady smart features. Bonus!
I kid, of course. I wouldn't want to use it myself, but you do you.