[eldenwrong]

>"Blockchains by definition are immutable post-finality."

This is the greatest misunderstanding. Immutability is NOT a property of blockchains. Its a property of Bitcoin and possibly Ethereum through PoW/PoS

[legutierr]

Could you explain what you mean?

As I noted, "by definition" a block that has reached finality will not be removed. Any attempt to add, modify or delete transactions or blocks prior to this point would be self-defeating because it would be automatically rejected.

Yes, newer blocks can be forked out of existence before they reach finality, which is why only blocks that have reached finality are deemed immutable.