When the Apple Air, with the M1 chip came out, I upgraded, because the charging port on med 2013 MacBook Pro was failing. It never occurred to me that my old laptop had terrible performance, it felt just fine. The comparison of the two made me not wanting to go back. Monitors feel like much the same, once you had a high DPI monitor, it's hard to go back.

I did look at the website of the local IT refurbishing company yesterday, and you can build a completely workable office/development machine (including monitor) for less than I paid for my current 4K display.

In some sense I am a little sad that I didn't just go down the route of refurbished hardware for 20% of the cost, but my eyes probably appreciates it.