This is possibly another naiive question, but is it even possible for a MAX at the high AOA for which MCAS was designed to detect to approach maximum airspeed? What is the scenario where you can actually pull yourself into a stall at this speed, and would any non-suicidal pilot try it? There should have been some sort of "sanity" cut out in the design -- keep in mind that the Captain's airspeed was reporting as even higher than the actual speed. Was there any speed limit, or would MCAS have activated at a speed that would have torn off the stabilizer?
I have a very strong feeling that the designers of the MCAS programming had no idea of the effect of speed upon the forces required to move the stabilizer trim, indicated by the fact that they slightly changed the algorithm to account for speed sometime during the certification process.