You can take a win 95 gui app and run it on windows 10 without issue. You can’t do the same on Linux.
For the sake of nostalgia, I downloaded an Encarta 2000 ISO form Internet Archive, then spun up a Windows 98 VM to run it on but that VM had a lot of sound issues in Virtual Box, then I realized that Encarta would also run just fine installed on Windows 11 lol.
This kind of backwards compatibility is not something I need on a daily basis but it's pretty neat that I can just run very old SW on my main OS without fiddling with VMs.
E.g. see this user report: https://www.reddit.com/r/SteamDeck/comments/1743cec/almost_s...
It’s pretty much guaranteed that Microsoft will add an extended support period to windows 10. Windows 7 just left extended support last year.