Re: "US, Canada finally ground 737 Max jets..."
My understanding was that manual trim would only disable this system for a couple of minutes. Then you'd be back to fighting it. A nice big loop of fight, disable, fly, fight, disable, fly. You'd better hope it doesn't trim down when you're trying to make your emergency landing.
Your stall alert makes sense 90% of the time, but in a real emergency there are too many alarms going off already. Adding information announcements on the end distract the pilots away from dealing with the other factors going on, and delays the other alarms from sounding. Better to have the pilots aware that this thing can go wrong in training.
Even better to have it run on more than one sensor at a time. If it really is one AOA sensor to each flight-control computer, that's just disgraceful.