Only adding enrages won’t solve the entire issue. A normal raid dps check that’s at the level of “eight casual players can reliably win, even if there’s a few deaths across the team” will easily be beatable with dead healers if at least a couple living players know how to do their rotations, and if the tanks and dps can keep the remaining players alive. Other people would need to die too. There has to be enough damage where only healers can deal with it, either in the usual output (like in M3 Normal) or when not everyone is alive to do a mechanic (like when there’s party stacks, or P10 Normal’s towers -> harrowing hell). Then eventually only the tanks are alive and they can’t beat the enrage even if they’re good at doing damage.

I’m not sure if taking away healing from tanks is a good idea because then a duty finder party might be more likely to be trapped by bad healers, especially when this game’s normal content currently does not teach people how to play their jobs properly. And this is a playerbase where there’s white mages that get mad if you ask them to use Cure 2.