#5.....The fact is that Boeing got it completely right in 1952 with the design for the 367-80 and all modern airliners are built in it's image.
Well nearly right...most modern airliners have the DC-2/DC-3 pattern of just 2 powerful engines, wing mounted, fairly close to the fuselage so how important is the bending relief especially now that wings are looking skinny and 'bendy' (787)?