The number is probably a bit skewed compared to previous decades, since graduate transfer rules were relaxed a good bit during the previous decade.
Also, for us, I don't see many names on the list of those who transferred, who would have made a big difference for our teams. I'm not including the ones who were dismissed because of disciplinary reasons.
While there are some obvious ones, such as Aaron Lynch, he's more of the exception, rather than the rule. Maybe Tristen Hoge could have been an upgrade over Trevor Ruhland, but other than that, I don't see the transferees really doing any better than the established starters on the ND roster.
Link: https://www.ndinsider.com/football/tracking-kevin-stepherson-and-notre-dame-s-other-football-transfers/article_39a63908-4d8d-5606-8259-afaba3884e1b.html