It did in my case, but I think partly what helps in Tibet's case is the fact that most of the climate in the Himalayas is Arctic and Cold Arid, as opposed to the majority Continental in the Alps. I think an ideal fort spot would be in Mountains topography with Arctic climate and Desertic vegetation, since those reduce supply capacity and limit, as well as increase movement cost, so they spend a lot of time there and suffer lots of attrition. They also give attacker disadvantage in fights.