How often is the opening decisive in ultrabullet?

just your estimation, thank you.
... and, in case, what is really decisive?
cf. https://lichess.org/forum/general-chess-discussion/what-is-the-best-opening-for-ultrabullet#1

0%
time

It can be decisive quite a lot of the time (eg if Bh6/Bg5 trick works to win queen/rook) but not so much at higher levels as the best ultra players will rarely fall for these tricks

Aside from that, no matter how much you dislike your position after the opening, there's almost always a way to manoeuvre out of it

The best bullet players are stubborn as a mule. They'll see an idea and execute it super fast without caring too much about the opponent's moves. As long as you don't overlook mate, premoving is the way to go in bullet.
The opening isn't that important but you need systems where you can play 10-20 moves at high speed. Maghsoodloo has tried 1 e4 a6 2... Ra7 3...Ra8. Ridiculous? In classical yes but in bullet you've made 3 moves with zero time and he's undoubtedly analysed deeper.