I would never pull a tail or shave ot with clippers.
I know some English hack people that do and like the old saying goes once you start shaving you will have to keep on shaving it and it will look terrible if you try and grow it out..
I find if you bandage the top of the tail the night before a Show it keeps it tidy and neat for the Show ..
I actually love the look. I don't pull my poneh's tails myself as we don't show but started banging them after spending a weekend in Lambourn. All the racehorses out for exercise had lovely tails and all were banged. Given my 2 are pasture puffs for the most part...it's probably overkill. LOL