He had 3 AT guns at one point, he could have easily taken care of the Schwer with the AT guns + the KV8, why didn't is a mystery to me. (Also why he suicide charged 2 IS2's and 2 KGV8's at a Panther + Jadgtiger)
In perfect world, yes but during game where it's not that easy. Why? because you cannot leave 3 AT Guns without any support, you must get all your units to protect them from a OKW blob so the rest map is completly open and as OKW, since you have 8-11units, you can move 9-10units blob to protect and save schwerer while 2 will cap the whole map.
And caches/opel will provide huge buff since you can get blob and even then you are floating MP. None faction can get 9 squads blob and still float. So you end with unstopabble blob and caches everywhere. Lower income from them, higher price, and remove conversion. Maybe then..