I know someone with 5 accounts, so they aren't THAT good.
Looking online it says "all new users" will need a Facebook account, but I already have an Oculus (rift) account, can I not still use that until 2023?
Facebook accounts are required to use the Quest 2, and from October all new users will need to use an Oculus account with any Oculus hardware. Existing Oculus account users can continue to use their existing accounts until January 2023, but will be unable to use any social features. Past 2023 Oculus have said they will try to keep your access to your content, but of course by then most stuff will be tied into Facebook anyway so I don't know how much will still keep working. Plus you'll probably be locked out of the store.