I agree that it's effective when combined with a unified pressing system - however, I am deeply intrigued by the difference between us and Liverpool in this regard. We both prioritize pressing and direct, quick transitions - the forms differ somewhat (Liverpool use a medium block when pressing, while we press right up to the opposition goalie), but the philosophy remains the same. Yet, Liverpool are evidently consistently creating chances of far higher quality than the ones we're managing to create, while only slightly suffering in terms of the volume of chances created when compared to our own approach.
So, what are they doing differently? And is their approach more sustainable in the long-run than our own approach is?
Well for one thing I think they just phave better intricate players than us, and they play with loads of them at the same time - think Lallana, Mane, Coutinho and Firmino are all better than any of our players at playing in tight spaces and breaking down a packed defence.
I also think that we're not pressing as much / well as we did last year, in part because we're constantly trying to pass it out short from the back.