This is effectively what the lead designer of this game told Healers in the latest live letter.
Consider if he had said that about your role (tank / dps) for a second and how you would feel.
Forget the leveling experience, it doesn't matter.
Forget dungeons up to 90, they don't matter.
Forget normal raids, EX's, and Savage, they don't matter.
If you want your job to be engaging, play Ultimate, the hardest content in the game that only a few percentage of actual players do.
Engagement shouldn't be either 0% or 100%. It shouldn't be either braindead easy in 95% of content or pull your hair out in the hardest thing the game offers.
The same basic damage rotation from level 4 to level 90 (A 30s dot and a filler spell) is not acceptable gameplay or game design.
Edit:
Yoshi-P's statement is about as tone deaf as the Lead Designer of WoW flat out saying they didn't want players playing a certain DPS spec. (Language warning)
Background: Instead of properly balancing a certain DPS spec, the WoW devs nuked it to the ground so people would play other things.
Sound familiar?