Wether the bite hurts or not is irrelevant. Even if you have a full grown female that happens to be in a bad mode and striking at you, you can avoid being bitten with proper handling technique. Again making the use of a hook for ball pythons pointless.
The OP wanted to know if it was one of those "must haves" and it's simply not. Some people may find a use for them. But they are far from a necessity for owning bps.
True, the only reason i brought up pain is bc why else would you use a hook for a ball lol?