I think it’s because that when we think of possession football, we think of attacking teams that apply possession to drag opponent out of the way, playing high up the pitch to break the opponent defence patiently.
Arteta’s “possession” is nothing about that. We sit deep, pass from the back, draw opponent players up the pitch and then play counter attacks, rushing everything, and dint care about keeping possession in the final third near the opponent box, because Arteta wants to attack the opponent as quick as possible.
I agree, but what do we do when the opponent is stubborn, plays a low block and doesn’t come out of their shell? We don’t have many answers to that. Have to score the first goal but it’s easier said than done.