Fair enough, but my point was that for a given set of capabilities (landing speed/distance, range), if you want to add more payload, you need more wing. The ad

Fair enough, but my point was that for a given set of capabilities (landing speed/distance, range), if you want to add more payload, you need more wing. The additional payload costs you drag from induced drag, but it also costs you parasite drag from the bigger wing you need to generate that lift at landing speed. You even see this with some stretched versions of airliners, they enlarge the wings or make changes to the high lift devices.