Well, I agree from Bandera. From the coach's perspective, it may be what CBI says, but not from the player's perspective. At a travel-team tryout, if you aren't picked for the team, you can go try out for another team. In college fall ball, you have enrolled and are taking classes at the school, and you cannot just switch schools easily, even at the semester, if you don't make the team.
As many threads on here have shown, plenty of high-school students commit to being a walk-on (i.e. non-scholarship, for whatever reason), and are then cut. I think there is a lot of misunderstanding among HS players about how this works and what it means - I've seen it with kids that I know.
I'm not saying that this data is easy to put together - and especially not that CBI, with the way you collect data, can provide it. But, looking at PG to see how many kids commit in a given year, and then whether or not they make a spring roster, is something that can be useful.