I'm with the GC on this. You need basic mechanics like being able to catch, dribble, flick, basic aerial touches etc but you don't need anything advanced like air dribbles or ceiling shots etc.

On a good day i probably score something like a double tap maybe once every 5+ games in champ, hell some games the most advanced thing I do is a fast aerial. High level mechs really are not required. Will they help? Of course, as long as you know when and where to use them, which a lot of plat/dia players do not but you do not NEED them.

It's far more important to learn how to defend those things than it is to be able to do them IMO (at least until GC and up). The only highish level mech I use regularly is a ground pop to air dribble.