See, what you're failing to grasp here is the basic concept that he further elaborated on the point he was making because he admitted he was unclear at the beginning. And who are you to say what is and what isn't allowed to bother someone? I think that it's an example of developer error that the items weren't removed, no different than the way some of Shadow's (FFVI) equippable weapons are obsolete without ever getting to use them because he is unavailable for large portions of the game, during which time you find further upgrades.
The Aeris storyline is finished, but you can't really argue that it somehow adds anything to the game to leave her detritus on the future vendors. It's useless clutter, and should be pared out - just because you don't give a shit doesn't mean you get to say that no one else does or that it's somehow meaningless.