With immutability we're just a legacy bug ridden piece of software.
~LOL~
I think the Monero has also hard forked to correct some kind of problems. So is the bitcoin and other coins.
You can't really compare a non-contentious hard fork of software (like Monero's) with the contentious hard fork of a blockchain (like ETH).
Since many noobs are, like you, confused about these basic-albeit-overlapping Crypto 101 concepts, I'll try to get an educational, clarifying paper written about it.
Working title: "There Will Never Be a Monero Classic."
Opening quote:
Second opening quote: [the excellent bit fluffy wrote explaining the same thing, but with more words, that I can't find right now]