Docking i
s barbaric...i
f the person doing it doesn't have a clue what they are doing.

(Which seems pretty senseless to me as well.) It's not a matter of "have to" so much as it is a matter of personal preference in regards to appearance or desire to adhere to the standard, which currently does still call for a docked tail.
Banding is a practice I certainly don't agree with.

It's actual illegal and considered a form of animal cruetly where I am and is punishable by law. (I would think it would be the same anywhere here in the US?

) However, putting one around your finger is not exactly an accurate basis for comparison.

We have full circulation and sensation in our fingers--pups that are only a few days old, when docking occurs, do not have full circulation or nerve function in their tails, so the would be a considerably lesser sensation that they experienced.
BTW, Welcome to YT!