Thoroughly agree.
Seconded, this is important. Even if possession in general isn't necessarily critical, it is important that we have the ability to keep possession at key times ie, end of games or to kill momentum. Right now we still seem incapable of doing this, although there was a nice spell at the end of today's game.
Used correctly, possession allows you to control tempo and dictate to the opponent. This cane be used not just to up the tempo and pressure the opponent, but also to slow the tempo at key spots.