You know the old matrix layout where we could pick various set ups of abilities and subclass specific perks? But maybe expanded with more skills, perks and options? I mean it doesn't have to be a 1:1 copy but the basic concept of setting up according to your preferred playstyle or to be more specialized for certain PvE scenarios would greatly benefit the game. It also has [b]way[/b] more potential to synergize with exotics.