I don't see the similarity other then that they are playing in the same line. There are players that you can place throughout the pitch that are chameleons, wherever they play they adapt. And you have players that have never scored a goal in their lives and start shooting from 40 yards at 0-0. Alvarez is very different, he's very dedicated to his position and his role, he solely focusses on stealing the ball and give it to the right colour. So as Superblue says, if you want a more well rounded player, Alvarez isn't the player you want. But well rounded doesn't necessarily mean better in a team, if one player just solely focus on defending in midfield, the rest has to focus less on that and can just focus more on attacking. He has quite an underrated role in Ajax' success in Europe the last years. What I do wonder if he can cope in the pressure of the Premier League every week, with Ajax there are important Champions League games followed up by games against teams that they could deal with on 50%. Plus there obviously are many examples of Eredivisie players that couldn't make it in the Premier League.
Now that I'm typing anyways, what about Kvaratskhelia from Napoli? Awesome player that gives it his all every single game. I don't think we would be able to sign him though, but what a player he is.