Yes, there other were factors. Not to mention Hitler’s decision to split his forces in half, one heading south, the other straight ahead.
Someone upthread mentioned horse drawn weaponry.
A captured German officer was allowed to watch supplies coming ashore on Omaha beach. He asked this captors where all the horses were. People don’t realize how primitive the Wermacht ground game was.
It’s neat to read the point of view from the other side. I also rad the German side of D-Day; it too was very enlightening.