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Er, why not? As someone else posted, Retainers have a level - it would be an easy transition to Adventuring Fellow/mule. They are not a crucial part, at all. They are simply random stand-ins that don't need to be there, an arbitrary location to go to to receive an item. There's really no reason not to do it all from a menu at this point. The concept of Retainers as sellers is a relic of the *dead* original concept behind Wards.
Why should they change it? You are asking for them to do unnecessary work. Both can co-exist as well. But before that happens, the two systems are closely integrated and thus do not need to be kept separate in the discussion.