> Otherwise, the differences between the OS you'll find will be minor

I think this is by design. If things are too different from one os to another, it raises the barrier to entry and hampers adoption. Furthermore, Linux distributions often also rely on things like standardized tooling and file system layout to ensure backwards compatibility

There are people who try to do new things in the space (gnu guix and nixos come to mind), but they tend to be comparably fringe when put side by side with something more mainstream (and perhaps battle-tested) like Debian or BSD