Maybe, but the names you'll likely to get on a thread asking a question like that are bound to be the overrated ones. The trainers with the big reputations are usually the self-publicist or ambitious times who know how to spin every victory into something big and sweep their failures under the carpet with good excuses. The quiet ones tend to get overlooked or criticized.
Does this only apply to modern trainers or do you think Futch, Arcel, Steward et al were overrated too?
That entire notion is nonsense,you are only as good as your trainer and how you communicate. Ask Holyfield what his biggest regret in boxing is and he would probably tell you letting E.Steward go bc he didnt want to pay him more money which in the end would have made him more $. you dont need the best trainer , you need the one you can learn from and that can help out the most with selective skill sets. Cus Damato was the best and he never laced gloves on before ,he learned from being around fighters and bfstudying film footage,he knew how tyo make exceptional fighters.