You cut our potential game playing time down by 75% to 6 hours. Would it be unhealthy to hit 24 hours straight of instance grinding? Sure its unhealthy but thats my decision not yours. When you limit how much I can play the game, you have taken my subscription fee which I paid for a service and then you limited that service AFTER I paid my sub.
Going forward if the game is less playable…then the subscription should be lower