I think that for the average Joe Mastodon looks too confusing and unpolished, compared to Bluesky.

Unluckily, the .world domain is ultimately owned by Ethos Capital, which is a private company that well may cease to exist in a short time.

You don’t need to know anything except the recipient’s account number.

You need to know the name of the owner of the account. At least in my experience, if you put a wrong owner number the money transfer will be rejected.