I didn't said that you have to push hard in 4man content
No it's not mandatory

But as the novice mentor said once there is no damage throw some DPS to help the team

If you follow someone and let the fairy heal
Why would à tank bother use CD ? why would DPS get out of aoe ?

Don't push but do a minimum
It's like whm that spam cure in dungeon it's like useless and mp wasted
With some micro illusion of healing

Like in the current Amdapor hard
You don't want to DPS fine, but on the first boss deal with the tether interception them and let the DPS do their jobit's à help and cost you nothing
On second boss deal with elemental bomb
On final boss protect them

There is many thing that à healer can do to help the team without compromising the healing job

Be a helpful healer, not a slacking one !
Nothing more insulting in a group to see a LAZY one when you're doing your part of the job (in DPS or tank)
If you go on duty, it's a synergy of 4 person