Why not danish oil the interior doors? Or shellac them?
I thought for doors oil or shellac+wax will not withstand well the accumulation of dirt at the area where the door is touched when pulled or pushed shut. Rather they will not withstand the cleaning on that area.
People tend to touch doors consistently at the same spot. Also the house has cats who will rub themselves on every available corner, and the owner (not me in this instance) would not consider rewaxing, buffing, let alone oiling again. Hence the need for a varnish.