Javascript for desktop extensions. Makes sense -- doesn't matter what processor you are running! Sure, depends on the version of the desktop environment - and each extension declares what version(s) it is operable for. The major problem is that I may be running (just for example) Gnome 40 on one machine and then Gnome 30 on another, and I really can't share the same home directory! That would be lovely if it could be worked out! Would also slightly simplify my backup strategies.

I don't see desktop extensions as the "core of the computation stack". Can you expand on that idea, please?