The thing is you get to pick half of the opening. Even if your opponent picks a 2 space high enclosure or does an early 3-3, they only pick half the moves, half the variations.
You can probably very easily break into an unknown opening, just tenuki, just play 3-3, 3-5, 5-4, approach a corner on the second move, play tengen, do mirror go, play a black hole opening… there’s nothing limiting creativity unless you cooperate with some plan or study that both you and the opponent have looked at
