Yeah, it is rather unfortunate the current direction of the game. Inno right now is doing a rather poor job compared to their past. Multiple bad main buildings, followed by the one event so many people hate that finally has an okish main building that rewards 0 side buildings almost. To the PVP arena, which is a terrible idea that they want to force on everyone. Instead of fixing what actually is broken, like GBG which has been crying for changes for months.
GBG really does need a overhaul, but my guess is that is too much work, easier to make an entire PVP arena that everyone hates that removes the pvp towers that some people like.
We got an update to place map icon and it helped immensely, man was GBG so bad before that update. So from that I know it is possible for them to do good updates. But right now with 0 attrition spam and GBG rewarding so much, its really too late to change that. Like you said, people already have hit it hundreds of thousands of times and have levelled their GB's to insane levels, much higher then 80.
I know it was originally designed to drain our treasuries and nothing else, but even on the newest server, which came out the same time GBG did, all the top guilds are farming the place already and have been for months.
If Camps/towers/traps/decoys never existed, it would have been so much more balanced. Then it really would mean more atk% more you as a player could contribute, and more good production too. Instead of one player being able to solo the entire diamond map.