They most certainly don't need a heavy bomber that might very well be better than any of the Allied heavy bombers in AH. That isn't balance and it most certainly bears no resemblance to history where the Allies fielded literally tens of thousands of reliable, workhorse heavy bombers and the Axis fielded hundreds of unreliable semi-heavy bombers in dribs and drabs along with a few tens of a decent Italian heavy bomber.
And oh yeah, just over one hundred of a patrol flying boat that could be used, more or less, as a heavy bomber.