As already stated, Ramuh extreme originally could be done without Tanks because SMN's Titan summon was able to Tank the boss. This was nerfed so that Tanks would be required. So SE absolutely do care when non-standard groups clear content, UNLESS it involves healers, then they couldn't care less.
I fail to see how these wouldn't help the role be more engaging. Random damage here and there, DoTs/Debuffs that are actually punishing enough to warrant using Esuna, more support oriented DPS options like a DoT that slows enemies so they attack less often or a DoT that heals party members that attack the affected target would all make the role more interesting to play.And let's be serious a bit :
-Have Healer to have a somehow complex DPS rotation will not help the role.
-Have healer to be forced to spam Physicks/Cure/Benefic/Diagnosis all the time will not help the role neither.
Mechanics have devolved from "I need to shield these 2 people that got targeted with prey or they will die while also making sure the Tank has enough health for the the upcoming Tank Buster" to "Stand in this spot" or "Heal everyone to full". That's literally all they are now. I haven't found a single healer mechanic post HW that actually required anything more from me than the bare minimum of thought. Most Heal checks in Savage raids are literally at the tail end of a fight and only matter in prog. Once the fight is learned, it's one of the 1st mechanics that ends up getting skipped almost entirely because the boss is already at death's doorstep by the time they even start the 1st cast of it, if even that. When was the last time we had a healer check that required using Esuna to purge a debuff but only after another mechanic went off? How about mechanics that required shielding party members or it applied a debuff on them, which is no longer viable only because they removed on demand shields from WHM and AST? There aren't any engaging Healer mechanics anymore and there hasn't been in a long time.I've always found FFXIV encounter are designed more like a puzzle challenge than like a brutal tests of skills. Considering this, having mechanics which need two healer or two tanks for the sake of healer and tank needed to soak them somehow is normal, fun and engaging.