I've never been happy about "natural=cave_entrance", yet I have used it several times because it seems to be the least bad of the tags currently in use.
The use of "amenity' is just wrong, because an amenity is something that is provided for a purpose (such as a cafe, bicycle parking, a charging station, a table, etc): https://wiki.openstreetmap.org/wiki/Key:amenity Furthermore, every other type of "shelter" has a deliberately-constructed roof (hut, picnic shelter, changing shed, sunshade, etc). A rock overhang is something natural that just exists. To my mind it absolutely belongs under "natural". The ideal would simply be "natural=rock_overhang". A map should tell it like it is, and not complicate things by trying to "fit a square shelter_type into a round amenity". Roger.
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