Aye - but it works both ways. Bringing in enough to attack the POS would probably close the WH - in which case their logistics would also be cut off.
Any WH going back to K-Space might also drop them into unfriendly space
Additionally taking the POS into reinforced without using Dreads would result in losses on their side of a limited fleet. Which means that should they encounter resistance when they attempt to take out the POS - is likely to lead to heavy, if not, total loss on their side. Whereas we have the protection of the POS shields
It doesn't take much to setup a decent POS, guns, some EW and hardeners and they'll have a hard time taking it down.