+1 to shanks.
Also, if you thought going through the teens to level was rough, after 20 the lvl requirements are astronomical. David intended for level 20 to act as soft cap, but all current content can be skillfully handled around level 15.
It is my understanding David still wishes to bridge the gap in suitable game play for lvls 7-9, so expect new content to include suitable things for that level range. This furthers the overkill of leveling past 20 for the foreseeable future.