There is no reason to ever consider dumbing down raids in a game with 4 difficulties. Especially when you already don't need to be perfectly min-maxed for any of them.
It'll just be like people have been saying from the beginning, there will be correct choices and incorrect choices. No different than picking a sub-optimal spec vs a meta spec. a person can play the game sub-optimally, but the game has never completely adjusted raids across the board to accommodate for those players.