One of the most simple answers regarding how German tanks had inherent flaws are in looking at the track wheels. They had inboard and outboard wheels, which were a superior design, but if one of the inboard wheels or it's bearings were damaged, three wheels would have to be removed. The tracks and wheels were a weak point of all WW2 tanks, but with the German tanks it was much worse.
German tanks were not designed for serviceability. Due to the wisdom of Henry Ford and many other American industrialists, American tanks, though vastly inferior, were field serviceable. The American tank, M-60 was very similar to a cross breeding of the Russian T-34 and the German Tiger and Panther. To this day, American tanks remain field serviceable, though the turbine engines on the Abrams are serviceable only in the fact that they can be modularly replaced. The same is true of all the treaded vehicles, Most notably the M-88 tank retrieval vehicle, capable of towing 80,000 pounds. The M-88 has an incredible V-12 DOHC diesel hemi. The intake valves are as big as the palm of your hand. Hearing that engine at full throttle is only surpassed by top alcohol and nitro methane dragsters.
The Abrams has dual turbine engines. Horsepower... just 1,500, incredible torque, but really lousy fuel mileage.
The ridges on the German tanks served no purpose. They were there because it would have taken an expenditure of labor to remove them.
The Germans would have annihilated us with their advanced tanks, but for two problems. They had about 2,000 Tiger, Panther and Leopard tanks. We had over 50,000 Shermans. Their other problem. They ran out of gas.