Coming from a past military and current LE position, my take is that both S&S and Q&D are extraordinarily good programs.
Time is of the essence with First Responders (not so much with Second Responders) working 10 and 12+ hour shifts. We dont have the time daily to spend an hour plus training.
Secondly, our training isnt for "sport". Yes, there is crossover and many MAs are very beneficial, but there's no tapping out on the street or in the jail/prison.
In hundreds of training, scenario and actual incidents I've never felt weaker than my opponent.
In fact, I've converted numerous 20-30 something officers to Pavel's simplified training methods.
S&S, Q&D and GTG pull ups using a heavy kb...32 to 48kg gives one plenty of strength.
Go at it with someone 1arm swinging a 48 and TGUing a 40+kg kettlebell after months of practice and see what you think.
BTW, Im 59 years with 15+ years of kb training behind me...practice builds resilience and strength. Refusal to be beaten isnt a motto, it's a necessity in LE.