In DOS2 you got xp going between each act to guarantee you were at a minimum level.
Its interesting that experienced players know how to max experience, and therefore quicker/ more than casual players. This just increases the divide between both player groups. Difficulty levels are part of the solution. Buts its also fair for players who do every single quest, take on the optional but very difficult encounters to get a reward (ie more xp, more achievements, more items). Im glad im not paid to balance this game.