understand dripping

I am trying to understand what happen when the water is poured on coffee in conical shape filter. From this video, the water move down if the resistance is low. Some factors are really important:

1. pouring speed, if too fast, water moves to the side and becomes under-extracted.
2. coffee grounds finesse, if too fine, water can’t moves easily and becomes over-extracted.
3. drop areas, don’t pour near the edge in the beginning unless you want under-extraction.

coffee brewed this method is more intense than just pouring carelessly.