In the current meta, cupolas make or break tanks as much as any stat. In close range fights it may actually be the most important aspect. Some tanks (especially Russian) have tiny or even no cupolas. This basically makes them impenetrable when hull down, and there is nothing that can be done other than sit in cover.
It’s also unrealistic that cupola shots can destroy a tank on their own. How do you blow up an entire tank just from shooting the cupola?
There really needs to be a rebalance where cupolas take reduced damage, tanks with giant cupolas are buffed to compensate, or tanks with tiny/no cupolas are nerfed, or some combination thereof.
Thanks for coming to my Ted Talk