Part of the effectiveness of spetsnaz was because the entire country was bombed over many years - particularly agriculture and villages - to the point where there were 6 million refugees in Pakistan and another 2 million in Iran, plus millions more in the cities.
The other part was that the Soviets and their regime did occupy, or had the ability to occupy at will, any place at any given time, because of their huge numbers of troops in country and just across the northern borders.
The Soviet response to Mao's "fish swimming among the population" was to drain the water, also called "migratory genocide."
The spetsnaz attacks took place after several years of these tactics, and can't be really separated from them.
Advances in weapons, intelligence gathering and intensity won't require "those tactics".