I can tell you from experience that if a kid has targeted schools well, it feels really good in the spring to have so many acceptances in hand. My son was accepted to 8 out of 9 schools he applied to, waitlisted at one; my daughter was accepted to 9 out of 12, waitlisted at 2, and rejected at only one. It’s nice to feel a sense of control over the final choice, and over the course of the remaining months of senior year, kids learn more about themselves and the schools that might impact their decisions. And it feels good when some of the match or safety schools include merit awards with their acceptances.
Obviously, the kids who aim too high and apply to all 8 Ivies with no true safeties don’t have similar experiences – but it doesn’t sound like your son is one of those.
There really is no good reason to lock oneself into a decision early on, unless the student very clearly has their heart set on a particular college.