If any of it is rewritable, none of it is immutable. You can’t have it both ways.
I don’t know that it is, though. Can you show me form of blockchain in the real world where this doesn’t apply? Saying large actors can’t affect a specific piece of internet technology, so far, is rather like teaching physics without friction. It’s nice and fun and easy to understand but completely ignores the reality of any implementation.
Go ahead and prove me wrong. Show me blockchain implementations that are immutable post append. On my end, we can talk about Bitcoin forks. We can also talk about the current state of consensus mechanisms, each of which has the explicit ability for large actors to rewrite history in their favor. Even Monero is susceptible because this is fundamental to the blockchain in any form. It’s been a huge reason why I make sure I get paid up front for any consulting I do in this space.
What exactly are some of the use cases for an infinitely growing, append-only database built primarily so its largest users can rewrite history at will?
I don’t think you’re using straw man correctly.
You’re naively referring to how consensus should work while completely ignoring both the well-defined attacks I referenced and the reality of large actors in a consensus network. You don’t know what you’re talking about or you don’t understand how the theory works or you’re possibly just being obtuse. No matter what, this is pointless. Good luck.