This isn't true. The trend, as the recent World Cup and Champions League competitions have shown, is towards 3 man midfields in which specialists of one kind or another are very much in evidence. The Premier League is languishing behind everybody else in that regard, but that's the way the game is going. And anyway, Chelsea last season employed a defensive midfielder in Mikel at the bottom of a diamond with the express purpose of winning the ball in a majority of games.
How many of the last Premiership winners were playing with a player like Alonso? He certainly wasn't complete either, there were weaknesses in his game too, many of which were complemented by Mascherano. A lack of mobility being one. Exactly the reason Del Bosque felt the need to protect the Spain back four by playing Busquets beside him.
There are no box to box midfielders any more because the game moves too fast, but there are a lot of teams relying on between the lines players breaking from midfield to score them goals, which is where a good ball winner becomes useful and often essential.
Mascherano isn't a pure ball player, but he does enough to be regarded as something more than an alehouse footballer. In a 3 man midfield the onus should be on the players ahead of him to make the play. In fact the whole point of him is to allow a team to commit more men forward because he is so good at recovering the ball or nipping counters in the bud.