Agreed, but the differences between the 737 undercarriage and A320 undercarriage is a quirk of Airbus not being around to launch its first gen narrowbody in the

Agreed, but the differences between the 737 undercarriage and A320 undercarriage is a quirk of Airbus not being around to launch its first gen narrowbody in the tiny turbojet era of the 1960s, not a reflection of Airbus doing anything particularly innovative in that market since fly-by-wire when it first rolled out. The market for 767 replacements had different demand characteristics (they didn't have many customers with all-767 fleets asking for a new jet with the same type rating), and the launch of the 787 was badly delayed by the new technologies, which are major factors other than program cost why they went for another 737 generation rather than a clean sheet.