This is false and yo should know it if you didn’t already. I picked 2 random logs from what looks like your weakest and strongest dungeons. Both times you were up there with the dps, beating the warrior in the weaker of them.
https://www.warcraftlogs.com/reports/d23aQq1V7GBhvpkz#fight=10&type=summary
Your strongest was an AA, the damage breakdown is this:
Mineru 26.12%
Scragula 21.24%
Koonaan 20.22%
Uriggyll 16.48%
Moofurìon 15.88%
This is a pretty good log to show the problem with healer DPS as well. Neither of you should be doing around 3/4 of a full DPS class.
The weaker one I looked at was a OPlains,
https://www.warcraftlogs.com/reports/TgrYha8W9cbAxPFG#fight=45&type=summary
Xandoril 33.91%
Subfocus 23.83%
Moofurìon 21.74%
Cruorosa 17.95%
Wlkrtxranger 1.20%
Even this one, which strikes me as a pug or something, you are doing around 3/4 of a full dps class, beat one, and almost tie the other.
Do you think a full DPS class should be able to heal 3/4 as well as a full healer, or take damage 3/4 as well as a full tank? I bet you don’t. This isn’t even getting into you beating the healer in healing done.
You’re exactly right. Blizzard has dug themselves into a hole here and it is going to be very awkward to dig themselves out without fundamental changes to those specs.
Fundamentally, yes. You even say so yourself.
Adding in self sustain means that healing is taken away from the healer and given it to the tank. One might ask, what do you think the role of the healer is if not to heal the other members of the group, including tank?
Could you provide a good reason why the DPS should also not be allowed to have that level of self sustain, that can’t be repurposed to defeat your own idea for the tank having it. Or at least 3/4 that level of self sustain.