I think it's silly to not think of Windows as the default "easier to support" option, because that's what it is.
"But X, —"
- iPhone/iOS's disabling of 32-bit app support
- MacOS/iOS's upkeep fees for "developer accounts"/app store access
- Android updates frequently break old apps or they get removed from the store (and more upkeep fees)
- Many Linux distributions, all with their own packaging/support nonsense
- Flatpak/Snap/Docker/whatever the "distribution is hard man I just want shit to run" solution du jour is helps this but you can kind of see the problem already with there being more and more variations
- Windows, by nature of its already immense install base, also has pretty good tools on other systems to run things; VMs, dual booting, etc. If you have a Windows game, there's a pretty good chance you can figure out how to get it running on MacOS or Linux. You have a MacOS game and want to play it on Windows? Good luck, pal.
You can still, right now, download the original cave story, for windows, a program with a last modified date of 18 fucking years ago, and it runs fine on modern Windows, with zero effort. I literally dragged it out of a zip archive and clicked it and boom, game. Hell, most older games seem to work pretty great. There's a few that don't, of course, but those are exceptions to the rules.
Windows, for all its flaws and faults, explicitly went out of their way to make compatibility a thing.
Microsoft, as shitty and garbage of a company as they are, did not decide x years ago "You know what? We're going to disable every single 32-bit program released for our device, just because we can, and there's nothing you can do about it."