For your particular case, you're referring to some of the slower blockchians. There are much faster and essentially free blockchains (like Base or Solana) which solve 1-3 on your list. UX still an issue.
Correct me if I'm wrong but this seems like a poorly messaged setting and an overreaction by users on X. Sounds like they will use a commercial AI when you use Dropbox AI to ask about a document.