If you think about it, it only takes one move to finish a match. Knowing the right move is the struggle.
There’s also a question of principles. Being in my triangle would feel nothing like being in Rickson’s triangle, because he incorporates more nuance into even his basic moves than I even know. So when your technique reaches a certain level, you don’t need to surprise people with obscure moves, or even have a wide array. You just need one tool for each situation.
And then there’s just energy efficiency that comes with skill. Beginners often try and force things when what’s needed is finesse.
As the Chinese say, many tools, none of them sharp.