It's a trap!
I'm with silencer on this one, but it really is a trap of sorts, as it's yet another way to get yourself even more invested in your crew on the field, but just too tempting not to play with.
I mean, think about it this way, SV - you could potentially bring in, say, the squad from Aliens, with Ripley, Hicks, Vasquez, Apone, Bishop, et al, and have them mowing down them xenos under your command.
Or maybe you want to recruit the Predator team, with Dutch, Dillon, Mac, Blain, Poncho, Hawkins.
Add all sorts of weapon mods and attachments and this is a pretty sweet deal all around customization-wise.
Beyond that, even, modders are just going to have a real field day with this.