I'll take "How to defeat your own argument for $500, Alex." It'll make decent players bad, because they'll fuck up healing focusing on DPS more often as they'll be forced to, bad will always be bad, but at least it's SALVAGEABLE. While healers that can pull it off, will do nothing but FFlog their numbers, and gatekeep for ego stroke. Knock it off with the "whataboutism" with the tanks, and address the actual issue. Everyone knows what this is about, healers who want to grandstand again. Lower tank and DPS self sustainability, sure, so healers have more to work on. That is it. Anything DPS related is simply a desire to grandstand numbers.
You have Red Mage (Oh look you main class). If you want DPS with a side of healing, there you go. Healers are HEALING WITH A SIDE OF DPS. If you want more DPS, play a fucking DPS class.