The impingement happens because of a lower pressure behind the "jets", or, a higher pressure ahead of them. Inertia from lots of rapidly moving water hitting a "jet" wall will create that pressure locally, though.
There are different ways of looking at it. Flow rate and pressure are being traded off constantly through the course of a watercooling system, at and within every component, but they're inseparable.
A waterblock can be seen as a deliberate restriction where flow rate and pressure cause turbulent flow.
I guess it's easier to make pumps generate flow than pressure. So we must use these pumps, and our systems follow.
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