It is assumed that the pilots will act rationally.
Isn't that assumption somewhat at odds with the condemnation of autotrim?
AF447 didn't enter the stall in full NU trim, from then on it took over half a minute of irrational control inputs to get there. Pilots acting rationally (even if only after the stall warning) would have never gotten to that trim state.
Not saying trimming up in a stall is not a bad feature, but how could it have been a factor here if there never was any useful attempt at recovery in the first place?