It would be largely fine, but be careful. Being immutable, a lot of things that you would expect will work differently or not at all. I would not recommend it, but if you’re in for a challenge, it’s not bad.

Open source is a license. What you’re referring to is “source-available.” You can’t legally fork, redistribute, or contribute to it.

Correct, but new users don’t want to need the command line for something as simple as installing packages.

That should work. One of the benefits of Wayland is that it’s better at scaling than X11. What version of KDE are you running? Is there a switch between two different types of scaling (one is blurry for XWayland applications but works for all of them, the other is sharp for all applications but only some XWayland applications and all Wayland applications work)?

Including non-binary people was not the problem. Relevant quote:

“AnitaB.org, the nonprofit that runs the conference, said there was “an increase in participation of self-identifying males” at this year’s event. The nonprofit says it believes allyship from men is important and noted it cannot ban men from attending due to federal nondiscrimination protections in the US.”

They identified as male, not non-binary, and the event allowed men to come.

Pretty much anything with XFCE, LXDE/LXQt, Cinnamon, MATE, a window manager like Sway or i3, or probably some others I’m forgetting, will work just fine. GNOME and KDE are the most popular but the slowest, and from what I remember, Deepin, Budgie, and Pantheon are somewhat slow.