Why would anyone who is passionate about wrestling want to preclude an athlete from participating in a competition for no real reason.
Because the coach has the entire team to concern himself with, not just one individual wrestler. While attending some tournament in BFE might be beneficial to that one wrestler (IMO it would not), that same wrestler could be helping his team get better by practicing with a lesser wrestler. As the one known wrestler has indicated in this thread, the week of practice with his team was much more beneficial than attending a tournament.
If a coach doesn't want to put his best wrestler on the mat then it is time to find a new coach
I would say that if a coach doesn't understand this IS a team sport it is time to "find a new coach"!