https://www.chiefdelphi.com/forums/s...d.php?t=136756
As requested, but there isn't a huge amount of extra information.
At the end of the day, both competitions deal with trying to stay away from AP exams in May, and holidays like Easter, as well as venue availability. Unless FIRST was to shorten build season (with its own problems) or shorten competition season (which forces more events in a smaller window, requiring more volunteers, more fields etc), then there ends up with a pretty narrow window to fit in the Championship events.