I think we're at our best when we try to move the ball forward as quickly as possible once we get it, wherever we win it. Those Pep teams were wonderful to watch because they were so confident on the ball, they could move it quickly forward or keep it at will. And if they started playing dull possession football Messi ran through 5 players and scored
I think we tend to start games well, but if the oppo are pressing us and we start to give it away, instead of persisting, we stop playing. And next thing you know every time we win possession we start playing it back instead of forward and then the inevitable slow, cautious, conservative passing game starts and we seem unable to shake out of it.
You can say it is Arteta's fault for not teaching the players to stay with it, or teaching them to pass it better, and you might be partly right. But I think the injured players and the players out of form means we're more likely to give it away and more likely to revert than otherwise.