The achievements specifically state clearing the dungeon, not clearing the dungeon at appropriate levels.. So it makes perfect sense. If you're so into commendations as you say, look at the likes you have received in this thread. 0, yep, Zero. THAT is how much people agree with all that you have said and is why no one has ever brought this up. The only person who cares about this change is you, just you, and it's only you who can't see that Commendations is a screwed system that does not reflect your game play in any way shape or form.

This entire thread is you throwing your weight around saying your commendations would be higher than your dungeons if you didn't run unsynced and want the evidence to prove it, believing it would show you off as a really brilliant player. It doesn't, in any way, it just shows that you have an ego problem, and believe the game should be changed to suit your sole whim.