I disagree. Russia was and is not a country that can be completely conquered, even the part west of the Ural. The Oberkommando of the Wehrmacht and the leading generals had therefore Moscow and Leningrad as major obejctives in their papers. The assumed, that Russia could only be defeated, if the central parts of the "Nervous System" of that state would be "beheaded". They wanted the Russians "to be thrown from the saddle" by slicing through the land with the tank armies and take the two major cities. Moscow was by far the most important objectiv. The Moscow of 1812 was different to the one in 1941. In Moscow all the communications and ministries of the Sowjetunion were located. All the center commands of the army were there and issued orders. You cannot move the complete government - "nervous system" out of a city. If the Germans would have taken it, the Empire would be haven been collapsed despite the industry being in the east of the Ural.
Stalin wanted to defeat Moscow and not leave it. Guderian urged Hitler not to attack Ukraine but instead directly carry on to Moscow by the end of August 41. Hitler rejected. The Russians were informed by their master spy Richard Sorge about Moscow as main target and were therefore completely suprised about the sudden change of attack - down south, into Ukraine.
In 1942 - Fall Blau - Hitler ordered his army down south. He lost interest in attacking Moscow once again. In 1941 the oil of the Caucasus played no role in the German strategy.
When Paris fell in 1814, Napoleon was finished. So was Hitler in Berlin. As the Ukranians want to defeat Kiev today, it will be the same result.
Have a nice evening.
Koala