I'm under the impression that they are building this game for the long term and yet needing to satisfy the player base at the same time.
Game needs high end content... so Coil for ilvl 70+ and ex primals.
Game needs a proper bridge between ilvl 48 and ilvl 70.. hence 2.1 ilvl48 dungeons, and 2.2 ilvl55, and 2.3 will be ilvl 60 etc...
Therefore it's not really supposed to be challenging by design because it is in fact low level content by comparison to the current high end stuff.