The aerosolized particles are the ones that wouldn't fall to the ground.
It's to allow respiratory droplets, with greater density and mass, to fall to the ground.
There have been a variety of super spreading incidents. However
1. they're small in number.
2. they rely on static positioning of people but overlook movement and interactions outside of the positional map
3. some assume no asymptomatic spreading
As for (2), choirs don't file into the space as they arrive, never interacting. They're typically a close-knit community and move around to interact before and after. They pass around things. I've been in choirs. They may stand and sing according to a map (but even then often get moved), but they don't teleport into their positions and then teleport out, a la Star Trek.
Same for buses. Even in restaurants--for Father's Day we went out and made a point of not moving in a straight line in a restaurant if it helped to avoid people. We nonetheless had to get to the table, we each went to the bathroom and back, and we had to leave the restaurant. Others travelled past us. Had we provided a map (in the event of illness) the map would have been fraudulent if we simply indicated "that's where we were." Had there been a vent overhead pushing air down when I sneezed, the droplets would have had not just the velocity from the sneeze but the velocity of the air they were sneezed into. I haven't seen an analysis that assumed anything but still air--mostly because the description of the contexts I've seen didn't include this (crucial) information.
Apart from fear, the critical thinking side still says I need more confirmation. Science is a bear.
One of my favorite quotes is "All models are wrong; some are useful." These model COVID transmission. They're wrong. The only questions are how wrong are they and how useful are they? Model validation is hard.
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