I find it hard to believe that the approach to this "problem" remains the same after two years. Unbanning every unlock works, but only if the developer behind the game actively balances all the items around competitive and I think its more than clear that valve has no interest in doing that. Assuming otherwise just means you're deluded. If Riot Games releases an overpowered and/or annoying-to-play-against Champion in League of Legends, you can be damn well sure that the competitive community is gonna ban it until the developers balance that champion. This is normal procedure in any (competitive) game and I don't understand why we should be the exception.
crib_You guys could've unbanned relatively inoffensive weapons in pugs, exploited the shit out of them and generated incredibly valuable feedback. We saw Valve implement sensible changes in Jungle Inferno and Blue Moon updates from your feedback, they aren't incompetent. But even after the changes it took so long for anyone to actually try out the rebalanced weapons. There's invite players who don't even know about balance changes.
Side note, I've seen the same thing with maps. No one wants to even give new maps a chance, they just see a couple big flaws in early builds and dismiss their potential. The only time they get played is when there's money on the line.
Please, Valve is so disconnected from the game in terms of balancing. They nerfed the Ambassador into the ground and the Righteous Bison also for no good reason. The Gas Passer is absolutely useless in any situation. There were probably a few exceptions but feedback from competitive players was pretty much NEVER a factor when they put together all the balancing updates.
And don't delude yourself, people usually realize very early on if a map has got potential or not. Reckoner was perhaps a bit slow according to some but people enjoyed it for the most part and then the mapper changed way too much and it was voted out of the map pool. It is as simple as that. Have you considered that maybe sometimes it is the fault of the mappers and not the players?