Pressure point techniques are generally ineffectual for several reason not the least of which is that you're trying to hit very a small target under pressure. Many people can shrug off strikes or pressure to those points. The same can not be said of areas which can easily be hit with larger, more easily and safely conditioned weapons like the temple, jaw, brachial plexus, liver, kidneys, or peroneal nerve. So anything which could be struck with the fingers could be more effectually struck by another tool such as a fist, edge of the hand, palm, or elbow.
Every MA has "vital point striking".
The correct theory has always been, to use the sniper analogy: Aim Small, Miss Small, Aim big, Miss Big.
I am not a fan of finger strikes so I don't train them, BUT I have seen them being used quite effectively under the right circumstances.