I've heard that boomkin single target damage is rubbish in pve as well. I don't know much about that as I (poorly) chose to go feral this season. But in cata I seem to remember boomkins being good at both. No one ever considered them too completely overpowered in pvp either, since they'd crumble if a rogue sneezed on them.
I understand why the devs don't want to just buff boomie damage across the board, they'd be insane in rbg's. But you could at least do something for our survivability. It wasn't even that bad until the hybrid healing nerf (which wasn't even that much of an issue compared to other classes *cough priests*).
Feel free to stomp feral into the ground, the spec had its one season of viability. We didn't even get all of season 9 (4.06 never forget) after all. But for the love of god, fix boomkins. It's not that I can't handle resto, but I have a resto shammy alt, and quite honestly resto druid feels mind-numbingly easy in comparison. I'm willing to accept all the stupid pointless clunky boomkin mechanics if it means I can do enough spread damage to get an rbg spot.