Schwerer is a dual side issue.
Its badly design and force extra taxative micro to counter it while it doesn't require any input to use it, as you explained it.
Because of that it forbid OKW to receive the necesary buff it should have on some of their units and generate frustration playing the faction.
Shwerer and Tiger2 aren't helping the faction as a whole to be balanced.
Tiger 2 is an expensive unit, so it's not something cheesy in the sense that you have ways to counter it.
In contrast if OKW goes fast BGHQ and then rushes the Schwerer to their proximate cutoff and fuel, you literally have no means of countering it, save maybe royal arty UKF that can buy an AT gun and pay 100 muni for a proper barrage. Asking the Soviets to send their whole army on that side and 2 AT guns and a spotting T70 is absolutely absurd. The schwerer is cheaper than a P4 and it cannot be countered at such an early stage. It used to be fine when Luchs and Puma were meta, but now that everyone is just doing P4 rushes it's extremely cancerous.
The gun should be a separate upgrade for 250mp 10f or 300mp after panzer authorization.