[SFUVancouver]

^ Setting aside the absence of fuselage ribs along the preposterously long continuous monolithic linear windows (have fun with pressurization), the fundamental issue with very wide body aircraft is emergency evacuation. All airliners must demonstrate that they can evacuate all passengers in under 90 seconds with half the emergency exit doors disabled. That will be challenging with an extremely wide body and proportionately minimal amount of cabin space being located on the exterior.