I'm going to put Surf on the spot. About 6-7 years ago, I was at a boys u-little try-out. There were maybe 30-ish players trying out for the A and B team. On the first two days, if I recall correctly they spent about 75% of the time on technical related drills. It included a group-wide passing/dribbling drill where there were about 7-8 stations that were all interconnected. You had 3-4 kids on each station and it was impossible to memorize or hear from the coach what each station required. So the players would not only have to focus on their station but look at the upcoming station to see what to do next. It required focus, concentration, and communicating with people around them. It was a fantastic drill to see which players were capable of thinking on their feet while maintaining their technique and focus. They didn't start doing scrimmages extensively until the last day of try-outs. I thought it was a very well-run 3 day try-out that gave a good sense of a player in various aspects given the short timeframe.
Flash-forward 4-5 years and the Surf try-outs devolved into 15 minutes of technical drills, which were basically just warm-ups, and then jumped into scrimmages for the next 3 days. It basically just highlighted the big and/or aggressive player, and the ball dominate players. It seemed almost impossible to systematically identify players who possessed a superior game i.q, focus, or tactical awareness. The numbers at the try-outs had also swelled to over 80 players.
Surf isn't alone, at many of the clubs the try-outs turned into huge cattle calls and the coaches job is simply herd them into a "B", "C", or "D" team cow pen. The "A" team players are now identified and recruit far earlier, so the A teams are usually set before the try-outs start unless some wonder-kid shows up. I've noticed over the years that at the younger ages, the A teams usually have the best wingers and forwards because ball dominate players are usually the easiest to identify at cattle calls. But many B teams end up having a surprisingly strong center mids or intelligent defenders. Those type of players don't always pop immediately during cattle call scrimmages. How many B teams have you seen that had a strong defense but just didn't have any firepower up front? This is partly the reason. It's also why you often see A teams where their starting line is basically 11 forwards and wingers.
I would love if Surf and other major clubs went back to adding complex technical drills to the try-out curriculum and just spent more of the try-out days getting a fuller sense of a player. if they did that, they might have less buyer's remorse and less of having 3-4 kids playing less than 30% of the game for almost the entire season. Then again, the business model has now changed, so large cattle calls are probably hear to stay for the foreseeable future.