All true, but the Taliban didn’t have air support and at one point the Afghan army was well supplied. Anecdotally I know from some people who had trained Afghan regulars embedded with him, they said that most of them were just horribly undisciplined and didn’t want to be there. Which, ok, the army sucks. But at some point the Taliban would be back and it would suck much much worse. 
It makes it even more messed up when you look at their secular government in the 70s and at least in places like Kabul seemed very progressive.
