If you have a ball in the backs and you do a number of short passes in a row, you are giving the opposition backs time to mark your forwards more tightly
Or you are giving your forwards time to get free, depends really.
It's about making the right decisions
Every in-game situation is unique in hurling so it ultimately comes down to this. Tactics should be used to allow fellow team mates an advantage in predicting what their own men are going to do in possession. For example, if the plan is play a wide game the corner forwards are going to be making runs immediately if they see their man is about to gain possession. The man in possession needs to make the right choice about weather or not the play is on. Its a game based on decisions as far as I see it.