I can achieve “don’t edit history” with a Merkel Tree; It’s what powers Git. Git also doesn’t consume the power requirements of a large developing nation.
I really don't think blockchains are a panacea and in many cases they're a solution looking for a problem, but that doesn't mean they're necessarily useless.
EDIT: Also as a sibling parent said, it's just proof of work what gets the bad rap about power consumption, and there's nothing inherently costly in blockchains themselves.
I grumble at the time limit on edits for HN comments sometimes, even if I do understand why it's there.