At last from the used items i see, when i look to other players, are savage player rare. Half are doing raids could fit. But, raids can be done on normal to.
Savage is probally only a lesser precente of player. And by calculating the potency are the normal dungeons and raids even important. So, that they are not becoming to easy or hard.

What is missing by the dev test is, with wich ilvl are they doing it.
Because it is suicide to do content with the lowest ilvl, would a midd lvl be logical.