I still do not think coaching is even remotely an issue by itself--people on twitter keep saying "individual sports never need them", which makes me wonder how many individual sports they actually watch on an even uncommon basis--but it takes up time, and considering how getting kicked out of venues for running too late has gotten unreasonably common in the past year, time is money.
here, a single rule to solve the troubles. I'll even properly capitalize and everything, so you can copy-paste if needed:
The loser of each match in a set has 60 seconds to choose their Counterpick, and then start playing on it. If they spend far too much time beyond this, their opponent gains another point.
(this means in a 2/3 set, the opponent automatically wins, and in a 3/5 set, the opponent simply has one less game needed to win)
the issue with all smash schedules absolutely has to deal with uncertainties in time, like it is btwn matchups. give it a max time limit, problems get solved