The skills.
I never liked them since they were introduced. This isn't a cry for LBD return, but I have a few survival type games with similar skill trees and they all suffer because the devs try to mash in the basic survival perks that every reasonable player would want into class trees. Their intentions are always the same, to provide freedom of choice while building your character, but doing this only restricts the amount of choices someone would reasonably make. Survival basics should be pulled out and placed into a separate tree with no ties to recipes, weapons, class, etc. Stamina for example. Everybody wants and needs it, no matter what character you build. Sure, let players gain a couple more percentage points by going into an agility build, but don't demand it.