As long as it's working (and not gross), why do you need a new monitor? My current monitor is a 2010 model, I think I got it around 2013. I don't know what a new monitor would do for me, other than have a worse aspect ratio, cause Dell stopped making 30" 16:10 monitors.

In theory, yes. However a lot of these monitors are still 2560x1440 and are 30”+. The ppi is quite low. I’m looking for 4k and something that looks similar enough to the M4 MBP I’m working on. A lot of these just don’t look good as they used to.

1440p is good enough that you aren't going to see individual pixels - just sit far back enough from the screen and use reasonable font hinting (Mac users are sadly out of luck here, but even then 2160p/4K is overkill).

Probably your new corporate monitor is also going to have relatively low ppi though. The problem isn't really the age then.

What Im doing wrong? My 24" with 1920x1200 from 2010 is doing quite fine until today?