It is unclear what your first post means. Are you saying there is a bug that causes gun destroyed only for Axis tanks? I can tell you the loss of a main gun is actually worse for heavies because it takes longer to get them back in the fight, while mediums can be repaired faster and can contribute piece meal if a push is imminent.
Try rephrasing your post.
1. I dont know what can be said clearer in the first post.
2. I totally disagree with this.
When there is a game at stake repair speed becomes irrelevant.
I highly doubt that mediums equvalent of KT (3 mediums or smth) get faster rep than 1 KT. While they get this MGD a lot faster. Even in 1 shot by some units.
Repair speed is separate issue i dont want to mix it in there.
This espessialy issue at late game all-in scenario, when you dive in and should kill his KT but 2 tanks out of 3 gets this MGD. Even if 1.