I think it is a problem because it doesn't really matter if there are fringy players on the 25 man if there are 20 minor leaguers that they like. In that case they are leaving at least 5 unprotected since at most there are only 15 minor leaguers on the 40 man during the season and usually less. Edit: I added Diplan, Houser, Peralta, Nottingham and Dubon to your initial list to get to 20 in this example. There are other minor league types like Webb, Wang, Lopez, Wilkerson, Williams that they would also have to DFA/trade/promote to the majors to get to the 15 minor leaguer max.