Take it with a grain of salt but i was talking with a level designer in twitch chat a couple days ago who said they were working on a objective game mode, didn't give much in the way of details so no idea what the objective is but (i think) he said it will not be a conquest game mode.
Has for the healing problem why don't we give it some time, the game has been in closed beta for less then a week. I say we just give players some time to come up with a counter, maybe there is some mid/high level upgrade or combination of upgrades that make it really easy to break a defensive team.
Yup, you were talking to me in Discord. And yes, an objective-driven game mode is in the works
The entrenched double healer tactic is something that's been around for a long time and something we're keeping an eye on. We've already made some healing changes over the course of the alpha and some more may come. We don't want to make a knee-jerk change that could harm the class at higher level play.