A major difference between a military bomber being rolled, and a modern airliner being rolled is who is doing it, their recent aerobatic experience, and why they're doing it. The military pilot was probably very well practiced at aerobatics in other types, so the maneuver itself was not new, just the type. So flying errors or lack of precision were less likely. And, there was an operational need to fly these maneuvers. A Boeing pilot might have aerobatic experience, but I opine, not as much as the military pilot, nor as recently. More importantly, why fly aerobatics in a modern airliner? What's the operational need? What need is balancing the increased risk?