For most it's not meaningless. I don't know the exact percentage, but historically a large number of commits in July stick. I'd bet at least 85% with the 15% being those that get processed or flipped.
I say historically because who knows what is going to happen this year. If you are bidding on eBay, you don't make your highest bid in the first day or few hours. You wait until the last minute and you make your final bids to limit what others can respond with. My guess is that teams that are willing to pay-for-play will wait until right before signing day and let loose with their cash. Could be an interesting ESD, and based on last year I hate seeing ATM lurking way in the back, but listed on "in" on a lot of the guys we are in on.
What is it with you guys ... I am not "worrying" about Venables and Dalbo. I am discussing their recruiting approach which is obviously out of the mainstream. I actually think it will hurt them, and helps us - once a player commits to Clemson, our staff doesn't have to waste as many resources and can move on. So I surely am not "worrying," I am happy to see this as I think it is a sub-optimal approach. Perhaps I am wrong, but the very top recruiters for the past decade haven't done that. Watch half of UGA's class get bought out from under them at the last minute, I might agree it's time for a change.