Disabling the mg hs was first step, after that came the rule.
But also for more fluent gaming we decided to keep it this way, ppl tend to make the camp near obj and mg is one of the weapons that do make it difficult for attacking team to get obj done, so even without hs ability, mg is strong weapon more than enough. Add to that, that defending team mostly is getting stacked or as defenders, obj is easy to block, atleast I wanted to do this small, yet almost useless effort to balance the power abit.