Most people here thinks that the healer MUST do dps even if the party isnt evading any attacks, its like "i dont care what happens you better keep me alive and at the same time do dps non stop" to help their weak dps.
Ridiculous ideas from noobs trying to be elitists, healer doing dps shouls be totally optional in every situation, it doesnt matter if its a hard content or easy content, after all even in the easiest dungeons theres people being hit by every attack.