A noob shouldn't have to think about any of this. They would install from gnome software or discover and not know the difference between flatpaks or rpms or debs.
Only appimages follow that model and the problem being solved is real and has nothing to do with any of that. The problem being solved is the huge amount of wasted work that distributions do by having to package and support every single project in existence for their various targets. Giving developers a single target like the freedesktop.org runtimes (in the case of flatpaks) and having them package and support applications is a much simpler and more efficient model.
That's not true at all. AI can in fact generate novel techniques and solutions and has already done so in biotech and electrical engineering. I don't think you understand how AI works or what it is
Because all changes are transactional so you can easily revert to a previous system state if you break anything