> I had 1 same Windows 10 install running on desktop for 8 years as primary personal PC

I actually have a desktop still running that got a launch party host Windows 7 Steve Ballmer edition install that's just been upgraded as time has gone on. Very much a Ship of Theseus machine but technically only ever migrated the OS image around, never reinstalled. That's 17 years of a Windows install so far, and its perfectly fine. That one install has made it through multiple motherboards and OS upgrades. It'll end up dying and being replaced once I get too uncomfortable with 10 EoL, this board is still useful to me but it doesn't have a TPM so Windows is dead to this machine.