You pointed out that people experiencing a medical crisis are often completely silent.
If a victim makes no sound, a gap is useless, unless someone happens to be inside, happens to look under the gap (which again, defeats the concept of privacy) or they manage to stick their limb under the gap, which is unlikely.
You cited the statistic that 11% of cardiac arrests occur in toilets and that every minute undetected drastically reduces survival chances.
That is exactly why relying on the random chance that someone happens to walk by and spot a hand sticking out from under a stall is an outdated safety protocol.
A sensor guarantees a notification after a set timeframe. Luck guarantees nothing.
Regarding false alarms from children: children also pull fire alarms on purpose.
I'm pretty sure we still keep them, and respond to any of these pranks. It could save a life.
You pointed out that Document T mandates universal toilets be self-contained rooms, and I already addressed that by advocating for fully enclosed rooms in these spaces, and yes, accessible design requires VADs in those rooms.