It's slightly different. On merc you have limited stats for your character (allowing you to buy certain weapons/armors) so the result is the same at the end. I'm using merc example because I believe it would work better for BL than Mordhau's.Never played Mercenaries, is it similar to CRPG? Because the way crpg handles it isn't exactly what I'm talking about. In Mordhau you have a limited number of points, from weapons to perks they each cost some points.
Its not a perfect idea, the devs would still have to balance weapon, armor, perks, and other equipment costs. Just would be something fresh, I just feel factions are a bit stale.