I understand what you're saying but there are battles that stand out, that can be argued had a decisive effect. For example, had the Japanese not attacked Pearl Harbour a whole myriad of choices and outcomes would have been massively changed. For me it's too simple just to say that it was a war of attrition because it's not always those countries with the greatest resources that win. Just say that Germany had stopped after defeating France and the Molotov–Ribbentrop Pact between them and the USSR had held. Under that scenario, Germany would have won and the US would never have become involved in the European theatre.
Battles can be decisive. Moscow was decisive because Germany didn't have the resources to hang toe-to-toe with the USSR. The Germans lost because they failed to knock out the Soviets quickly by way of causing the Soviet regime to collapse. Only the capture of Moscow and/or the fall of Stalin could have caused this. There was nothing decisive about the Ostfront after 1941, it was just the sound of inevitability that the Germans heard thereafter as Agent Smith might have put it. The built-up attrition was only ever going to favour one side. It was like a pride of lions chasing after a separated buffalo. The buffalo will put up a valiant fight for survival but in the end its death at the hands of the predators is almost guaranteed. So was a favourable Soviet outcome in the Ostfront from January 1942 onwards.