There's so much evidence to the contrary. Here's what immediately comes to mind:

Healers are boring and they haven't changed for multiple expansions.

2 minute meta is boring and they keep playing into it.

Viera/Hroths don't get hats.

Perpetual housing crisis and they still refuse to do instanced housing.

All the drama around Kaiten removal.

Another V&C dungeon added and still has crud rewards and no reason to do more then once.

Every relic step is tomestones.