I would hardly say Germany had lost by 1941. And again, my what–if scenario focuses on forcing England to sue for peace early on. They didn’t have the range needed for fighters to escort bombers at the start of the war. it’s why the retreat from Dunkirk was done with small boats. They didn’t have the ability to control the air which made larger ships vulnerable to German planes launched from France.
They didn’t rely on Strategic bombing in their fighting tactics. They advanced quickly using precision bombing to support rapid ground movement. the BF-109 and FW-190 were excellent fighter aircraft built in large numbers and the JU 87 was a fearsome ground attack plane.
The Russians had a great ground support plane with the IL-2 which was the most produced plane of the war. It was probably the most heavily armored plane of the war so it took a real beating. But they lacked a fighter plane to protect it.
I think it’s well established that entering into a 2-front war was a major mistake. My what-if scenario removes the UK early on which means they have unfettered use of production facilities in captured land. Instead of burning up assets defending factories they’re using the factories to create more assets. It’s not just a 1-front war, it’s a 1-front war with much greater assets. So they’re taking ALL of the assets used to fight off the Allies PLUS additional assets produced as a result of factories that aren’t destroyed by the Allies. They will have more tanks,planes,artillery,ships, fuel, food, soldiers etc… to go toward fighting Russia.
By taking the UK out of the war it removes some of the best weapons developed which was airborne radar, hedgehogs, and the ability to decode the enigma quickly. These were game changers in the war. I suspect they would have still have been developed collaboratively but at a slower pace.