Yeah, i was writing a comment on that.
Lone wolf is in no way a cheat.
It's an attempt to make some adjusting to those players that want to play the game with only the 2 protagonists. It's more of a hardcore self-gimpish pick that still gives you a chance to play even on hard and to an extend makes you feel like you have your main chars more important and powerful than any other playable npc in the game.
But playing with 4 chars is much easier than lone wolf, so LW is the solution of the designers to allow players who want to play with 2 only to play the game, without making it extremely easy for those that play with 4 and without making it impossible for those who play with 2.
Overall a very good skill decision for what its purpose is i think.
Give those who want to play it that way the opportunity to do it without ruining the game for them or for those that don't use it.
In no way it's a cheat.