Ontario person here.
Like many others have said, the main advantage of Districts is the ability to improve. Last year, we won the RAS, made it to Worlds, and… I’m going to be honest, we didn’t do so well at Worlds. We essentially got two competitions and 20 matches under our belt.
This year, having unbag time was really useful, as well as having two events. Even though we were 24th pick at our first event, and would have qualified to CMP in a regional system, we would have had a mediocre robot. We built several improvements to our robot in the 6-hour unbag time, and improved our record (and robot) at our second event. With these matches ALONE, we were able to get 24 matches.
Thanks to two awards, we were able to qualify for Provincial Champs, where we’ll get another 12 matches. In my opinion, addressing the OP’s point, I think the advantage of the district system significantly allows a team to improve during the course of a season. Yes, the best teams will always qualify to CMP. It’s the question of how to determine the next best who qualify, and I think districts does a better job of that.