This is a false equivalence, you know. Alas, this isn't even a fair comparison.
Nearly 100% of the DPS toolkit are damaging skills or support skills for attacks. The DPS can use nearly 100% of its toolkit and do absolutely nothing outside its role. DPS don't have to tank and don't have to heal. Maybe drop a skill or 2 for the rDPS sake.
There are some raid utilities, true, but outside a heavy META content, actually using them - while welcome - is not something that the group is nazi for. At least, never saw a BLM being shamed for not using thunder spells, never saw a party kicking a RDM for skipping the sword phase (the coolest part of RDM's rotation IMO) or refusing to heal.
For what is being said here if the healer - for whatever reason - lacks off DPS, the party should instantly open vote kick against him and blacklist that damn noob.