In a busy class, it can be difficult to tell how much of a problem it is. I might see one strike that looks a bit hard, but if the other person "toughs it out" and doesn't fill me in, it might be hard to tell how hard the strike was. And I'm probably not going to see them all (again, busy class). So, I might know someone's control is lacking, but not know how bad. That latter is important, because I'll give general comments if there are a few people who are off a little. I'll have a personal chat if someone has very bad control.This is something that shouldn't have to be brought to the instructors attention. If the instructors are unaware of reckless sparing, then they are not paying attention and properly doing their job.
I feel that any student should have the right to speak up regardless of their rank or age. If that is a problem with the instructors, well, what can I say, I'd find another place to spend my money.