This is laughable
At the end of the day, the problem with the 268v4 are not the small micro problems like cupolas, it's the fundamental problem that it's a broken concept. Wargaming want to nerf it to 'maintain its role as a fast breakthrough tank' but the thing is that a 'fast breakthrough tank' is just an intrinsically broken idea. Breakthrough tanks are supposed to be slow and reinforce the tanks which have occupied key positions first. No matter how you try to nerf it, as long as it's a 'fast breakthrough tank™', it will be broken. It may stop being OP but it will still be broken. Sure, you can nerf the cupola, you can nerf the gun and reverse speed but that's just going to make it more frustrating to play and not improve the game. Players will still be forced to just ignore Malinovka hill in a medium tank because that 268v4 is going to get there first and you can't deal with him.
Look WG, you tried to introduce something unique, a fast breakthrough tank. It didn't work. You'll have to either take away the fast or take away the breakthrough. There's no other real solution.
This is a lazy and malicious cop out. This is their way of putting on an image of dealing with the problem without actually dealing with the problem. These people are disgusting.