> There are a handful of professional uses for a workstation

I've historically built my own workstations. My premise is that my most recent build may be my last or second to last. In ten years, I will still have a workstation - but not one that I build from parts.

I also built my own, since the late 90s. But I'm not building my newest: a 96 core threadripper with 768GB ram. I went with a specialist to ensure it works compatibly. I expect it to last me a good few years, and I don't really anticipate replacing it with anything too similar.