Try Win11 on that old PC, and you'll really feel the need for more RAM and a better CPU.

I sometimes feel M$ is deliberately making its Windows OS clunkier, so it can turn into a SaaS offering with a pricey subscription, like it has already successfully done with its MS-Office suite (Office 365 is the norm in corporates these days, though individuals have to shell out $100 per year for MS Office 365 Personal edition). We can still buy MS Office 2024 as standalone editions, but they are not cheap, because Micro$oft knows the alternatives on the market aren't good enough to be a serious threat.