Kicked from DR Leveling because I don't slot Protect for low level dungeons?

[Kosmos992k]

Or it shows new players that healers can contribute meaningfully to total party damage and dungeon completion time while promoting evaluation of abilities and how they really work.

No, it really doesn't do that. All it does is promote a Raiding Meta as the default way to play long before it's needed or even appropriate. When you get to the level 50 dungeons and up, what you're talking about begins to matter more, but when people are still learning how to play - the sub 50 dungeons are the game's tutorial - you could at least let people learn to play their role and job before fostering a raiding mentality.