Well DMC isn't really in the same vein as this no resta discussion. DMC was just something Sega never really knew about, and literally nullifies damage.
I would prefer to have DMC back in the game rather than a "fix" to a community issue like party heals.
Random parties would infer to being able to play with fresh level 80's on their first character ever, players with 32 level 200's, and everything in between. A massive spectrum of skill or lack thereof.