The 757 flight simulator that I've flown was a full-motion flight simulator at UPS's Louisville training facility. I was helping conduct 6-month certification flights as co-pilot. I would say that if those simulators are good enough for UPS's 757 pilots' recurring training, they're good enough for this Cessna driver to understand that difference between his plane and a 757. Answer: Not that much.
Because the A320neo can fit the engines under instead of in front of the wings, thereby negating the nacelles contribution to leading edge flow separation.
Exactly. Except it’s not flow separation that is the problem. It’s the lift that the nacelles generate combined with their mass and moment far ahead of the center of gravity