Knowing how some other attractions' pre-shows operate, that's actually surprising...
Edit to add: Though now that I think about it, Star Tours' seems to be linked to the ride cycle rather than making sure the grouping is done first, and they have ride safety info in theirs...
-Rob
I guess its just up to the cm who assigns you to each loading area to try to get as many people there before video starts. When I was there in July we were all there and the video took a few minutes to start