Oh please, please do roll more mdps Warrior Priests. All my Destro toons could use more easy renown.
Thing is, I played DoK on live for yearss. Healmode 99% of time, but occasionally tried dpsing and it would always offer shitty results.
And it's relatively simple to understand why dps healing still does not work.
Basically you either focus 100% on dpsing, or you focus 100% on healing. Some healers like AM/shaman can do some dmg-healing, but even that is about 100% healfocus by finding soft targets that will allow BA/ITT give back greatest healreturn and thus maximizes their healing output.
Dps shaman/AM are "decent", but I would say they are diet-"sorc"/sorc-lite tier, that is, were the gifted dps shaman player to roll a sorc, they would be maybe twice as effective and far deadlier.
Same applies to dps DoK/WP, if a good player somehow "shines" on a dps DoK, they would make a godmode marauder/choppa player. Holding the player skills as a constant, we just upgrade the "arsenal" at their hands, and realize that their full potential only becomes unleashed when they play a dedicated career that actually fits the role of a mdps.
Whilst many classes are situational, dps DoK/Wp are maybe the most situation classes, that is, their niche where they can excel is the most limited. They lack charge like WE/WH do, they lack pull/fetch that mara/WL got and they lack the pure high damage that choppa/SL unleash. But in return they got their lifetaps.
Thing is, lifetaps don't kill enemies, they barely prolong the fight for your own side, maybe by few seconds, maybe longer. However lifetaps don't help you jackshit if you lack the burst to take down an enemy.
Essentially when people see a dps Dok/WP in SC roster, they think "that's like a half-mdps, half-healer" and they know they cannot expect real burst assist nor can they expect real reliable healing output from that player. Yay? The team would be better off had the scenario slot been taken by actual dps or by an actual healer, instead they get a hybrid that falls behind in both categories.
Of course there are weird and rare situations where 5 players come together and help the mdps dok/Wp shine in that specific situation, but as said, the niche where dps dok/wp can shine is extremely limited.
Now don't take my post as an "I hate all mdps healers", it's just that I've tried doing it on live time after time on my DoK, had various arguments over the years, and in the end most people end up agreeing that hybrids just do not work when compared to actual dedicated mdps or dedicated healer who specializes in one thing with full focus, instead of trying to juggle with too many things with well known end-results.