I tend to agree that seats may be the preferred verb with respect to providing accomodation, but it is very difficult to know since sits is the only correct verb for describing location.
The only hole in your theory is the one case where an item is seated to another item, which is where the intransitive usage of seat comes into play.
A monitor is seated in its base because it is physically connected to it. It does not sit on its base, unless you have chosen not to connect it to the base.
Good Luck
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