It’s immutable Fedora.
Yes, it helps users not to accidentally break stuff. That's a benefit for regular users, not a downside.
Immutability is something that not even regular Fedora uses, because it causes weirdness and potential trouble if you don’t just use it as a wrapper for flatpak.
Even regular Fedora is a better alternative to (K)Ubuntu because of all that unsupported software in Ubuntu's Universe repository. All software in Fedora is supported, not just a cherrypicked subset.