The West Bank is occupied by Israel and Israel has overall control, but it is broken up into a whole bunch of tiny administrative regions, some of which are administered by the PA and some of which are administered directly by Israel.

Gee i wonder what happens if Israel just let the west bank be. Wait…i know what will happen

Rocket factories, like the one that was discovered week ago https://www.ynetnews.com/article/bjbqu9qolx