Anything better than POW stories?
Which is covered by equipment.
Pretty much all German guns had armor-piercing shell, and some had HEAT rounds. Not sure what superiority is there?
Because Soviets didn`t have enough radios to make it otherwise.
Again, this "more", not better used.
Nebelwerfer. In fact, I think Soviet usage of mass planed bombardments kinda shows their keen awareness of their inability to direct artillery strikes well.
So, I get it, US made great effort on artillery targeting, so what about the rest?
Yes, Soviets did use airborne. Then, Brits, US and Germans also have. But unlike Germans who had Crete, and Allies whom had Market Garten, Soviet ones are far less known, for lack of big operation to make them famous.
Again, Deep battle is not a novel concept. It flows kinda naturally from poor infrastructure in East Europe, where capturing infrastructure is far more critical due to far fewer redundancy point existing, unlike German doctrine, that emphases destruction of armed forces, because infrastructure is far better, and troops are more manuverable.
How many transports were actually available for the drop?