Back to your point, Manjaro runs directly on pacman repos, not a layer between it and upstream. It just comes with IMO sane defaults and an installer GUI.
If not, I think it doesn't make any sense to use it unless you are a seasoned user. Rolling release will make running big frameworks like KDE tricky, as things will change often. And unless you have set everything up yourself, you won't know where to look in order to fix things.
I'd recommend you look into NixOS if you want to run a desktop environment. It's radically different (totally functional and declarative, whereas Arch is imperative). All Python and deep learning stuff is neatly packaged and tested. And rollbacks are trivial. There's no state.
You can even run Nix in other distros or macOS.
On the contrary, you get new releases (with bugfixes) much sooner.