You can certainly run Windows 11 on very old machines, but my question is, how exactly do you use them?
I have an eight-year-old Core i5 6200U laptop with 16 gigs of RAM that's a lot faster than the systems you're using, and it's a literal pain to use to browse the web. That's of course with uBlock Origin installed and enabled both in Firefox and Chrome. It's just so slow.
Secondly if your system is old enough, it may not necessarily support hardware H.264 decoding at which point watching anything on YouTube/Vimeo/etc. becomes nearly impossible.
And 1440p and above just becomes unattainable because VP9 is a quite heavy codec.
I'm all for keeping older devices whenever possible to reduce the amount of e-waste but not to the point of throwing tantrums because of how slow everything is.
