Every Premier League team has now adopted some form of this behaviour (although I believe Arsenal is to blame for the initial inspiration). Every time you look at it happen you wonder how on earth it is allowed to stand by the refs? Then you take a step back and think about it. A lot of what takes place is not strictly against the rules per se.
I agree with what Arteta said recently, that we should have more spaces on the bench because people are employed by this club to train, to be able to be available to play. And it's the worst thing you can do to take that right away from someone come the weekend.