"and history has shown that trying to make one type fit both land-based and carrier-based is rarely successful."
that's sometimes correct but often the "other service" makes so many crazy demands for changes it turns out to be another aircraft all together - read Bill Gunstons "Jet Bombers" for the saga of the A3d Skywarrior/B66 Destroyer saga - they took out the wing fold, changed the profile and plan, changed the engine type, redesigned the slats and leading edge, took out the extra strength for carrier ops etc etc etc and finished up with an aircraft that did exactly the same things but was slightly faster. had shorter range and was 3 years later than if they'd just bought the Navy aircraft to start with