The flip side, could be, welcome to the challenges of trying to have a program to satisfy as many people as possible.
Given it's a subjective process, who would be better than the coaches to evaluate and select the players?
Tryouts are no longer just one day. They used to be one day only. The tryout process continues through the first sub regional event, particularly in groups where only 1 team will go to region camp. Even in these cases there may be 2 "teams" at the sub regional for further evaluation, but, only 1 team selected to continue on to the regional camp.
Now, if you have a group of more than 36 players, then it should be easily understandable that the team selection could be done in steps. I think it would be cost prohibitive to take every player that signs up to the sub regional. This likely causes a pairing down on the list prior to the sub regional event. Unfortunate, maybe, but in the end, not all players that attend tryouts are selected to continue on.