Remember, you were a grunt in the army that never had a bomb droped on it's grunts head for over fifty years.
How did that happen? What kept the enemy from raining bombs and heavy shells on your head while you were grunt?
Coming back to the AK. It wouldn't changed too much. It could have done more damage if the Germans could capture it early on, mass produce it and use it with their superior tactics.
I think the AK was a natural evolution in the new Russian fighting doctrine. Sure the Germans had some influence, but i think they were more influenced by the cartridge than by the rifle. Saying that is just natural for any firearms designers to try to incorporate the best the technology offered at that time in their next weapon.
After the bad beating Russian troops got in the Winter War from submachine gun armed Finns, the Russian started using a lot of automatic submachinegun fire.
They sometimes armed entire companies with nothing but Ppsh submachine guns. Once they discovered the ingenious new German cartridge, 7.92x33mm, it doesn't take much to realise the great improvement this "medium range" cartridge could offer to their new tactics heavily reliant on mass automatic fire.
The AK-47 was not considered a "rifle" in Russia. was called "Avtomat". It was considered closser to a submachine gun or machine gun than a rifle.
When you take a reall AK out of "safe", the weapon goes in full automatic fire. Only when you push the safety all the way down the weapon goes in "Semi auto".
This goes directly hand in hand with their fighting doctrine based on mass automatic fire.
Before the AK was selected in 1947, there were a lot of good lessons learned by the Russian gun designers from their own experience or from other nations. When the Russians wanted a new weapon, they provided general guidlines to few design teams and asked them to provide prototypes for a competition.
From here on things are different. There was no such a thing as patent protection in communist Russia. After they select a winner, they get everybody together and try to figure out how they could further improve the winning design, with best things found on weapons from the other cometing teams.