I generally agree you should buy fast machines, but the difference between my 5950x (bought in mid 2021. I checked) and the latest 9950x is not particularly large on synthetic benchmarks, and the real world difference for a software developer who is often IO bound in their workflow is going to be negligible

If you have a bad machine get a good machine, but you’re not going to get a significant uplift going from a good machine that’s a few years old to the latest shiny

5950x is such a great platform. I can’t see replacing mine for several years at least.