Considering the massive amount of different skill-sets you can arrange it would be nice if we could get dual spec. Meaning that you have 2 skill “profiles”, between which you can switch while not in combat. If you want to play PvP and PvE it would be ridicoulusly expensive and annoying to buy a skill reset everytime you switch from one activity to another.
I hate to be this guy, but: WoW has it, it works, it would be easily applicable to ToS and I do not see a reason not to implement it.