The other thing that helped at Omaha was the decision to abandon the plan to open the beach exits from the front. Rather, people went over the hill, then came around the back against the fortifications.
“Saving Private Ryan” gives a good flavor of that effort. “The Longest Day” doesn’t.
Aother thing overlooked which was a complete disaster and acknowledged as such was the operation 2 years prior to D-Day, the anniversary of which is today coincidentally, and that was the Dieppe operation. Dieppe was a complete and utter disaster but is referred to as the practice run for the D-day operation. Sorry, one of my courses in University was European History of WWII and I have walked the beaches of Normandy many a time. As others have mentioned to have split the formation and left Omaha would have led to another disaster like Dieppe.