I will sort of piggy back off what @adbono said based on my 2021's experience. I encouraged my son to get into any collegiate league he could last summer to help better prepare him for the fall. He didn't want to. He wanted his last summer with his friends, days at the lake, etc. And how can any parent in good conscience argue a kid isn't entitled to that, right? In some ways as a parent, it seems right to encourage that sort of thing.
But I can tell you that my son was nowhere near as prepared as he could have been. Every person and player will look you in the eye and tell you they know college ball will be much harder than anything they've seen. But for almost everyone, it's much tougher than they figured. You can't truly know until you get there. That is, unless you listen very closely to those here on HSBBW. My son was no different and argued that the disadvantages of not playing in a collegiate league league wouldn't hold him back. Well, it did. He's going the Juco route so when he showed up on campus, there were guys already there for 1 and 2 years. And every one of them had just gotten done playing in a summer collegiate league AFTER they played 1-2 years of Juco ball. There's no way to not sound boastful in saying this, but my son - a MIF/OF - was his Juco's first 2021 class commitment and 2nd 2021 offer behind a pitcher who declined. Until an 11th hour addition committed, my son was ranked highest - by quite a bit - by PBR out of their 2021 class. His metrics were also better than anyone else in his class. So yeah, embarrassingly, we felt pretty good about his chances. Not arrogant or entitled, but we felt pretty good. I felt playing collegiate league ball before getting to campus would be ideal, but that not doing so wouldn't handcuff him at all. So did my son.
Uh, no. Looking back, it might have been a difference maker for him. He did alright in the fall, but where he's about to fit in this spring is very much in question. The 2nd and 3rd year (thank to Covid) guys are that much more experienced, coached and bigger/stronger/faster. With all those advantages over incoming freshmen, playing collegiate ball was definitely something within our control to increase the odds.
@adbono is spot on. There was no grace period for my son or any freshmen. Nobody says "we'll give the freshmen some time to find their bearings and get up to speed." No way. If think your son will have a few days of leeway, think again. Here is an example to help put it into perspective. 1-2 months before freshmen had to report to campus, the coach started having them run back home. They had an app and had to run certain distances in certain periods of time with verifications going to the coach. Every player who plays there must test out for a 2-mile run when you get to campus. It needs to done in under 14 minutes. They had to report to campus on a Sunday and move in. The next morning at like 6am, the players are lined up for their first shot at passing the 2-mile run. 15 kids DIDN'T pass it that first day, so about 25 did. My son was one who didn't pass. Ran something like 14:20. My son is fast (6.6ish speed) and was in great shape, but he failed. And the coach was VERY displeased with ALL who failed it day 1. You might think it's harsh, but it was black eye/stain for 15 kids. On Day 1. Don't think for one second that coach didn't/doesn't hold it against them. All but 2 or 3 passed on day 2, but not one of them was praised for passing it day 2. It wasn't at all a good thing to pass it on the 2nd try. No pats on the back. It was simply better than those poor guys who failed it on day 2. While this doesn't have anything to do with collegiate summer leagues, please know the importance of showing up already "there." Be ready to compete literally on day 1. If you're not "there" until after the first 7 days or whatever, good luck. Because almost everybody else was "there" the moment they showed up on campus. It's a tough pill to swallow, but be great and be great the day before you step on campus. It feels like losing game 1 and immediately finding yourself having to play through the loser's bracket. And everyone know how hard that is. But I'll bet few feel it's possible to fall behind on day 1. Trust me, it's very possible.