"Amenity= drinking_water is non specific. It does not tell me if I can drink directly from it (I can from a man_made=drinking_fountain), fill a water bottle without trouble (I can from a man_made=tag, drinking_water=yes), fill a caravan water tank (I and from a amenity=water_point) .. etc etc. People did not want to add subtags to amenity=drinking_water as you have done because some of these features have sings that say drinking_water=no, to have a feature with amenity=drinking_water, drinking_water=no is not good! ."
I think that man_made=drinking_fountain is subtag man_made=tap. man_made=drinking_fountain is very different from amenity=fountain. See how it works. "drinking_water=no is not good." you're right, but removing drinking_water=no would require removing completely drinking_water=* which is rather not the best thing for many reasons. You can always describe in the wiki that man_made=drinking_fountain do not require drinking_water=yes because in all cases the water comes from a safe source. You also have tags like drinking_water:legal=no/yes I think it would be worth adding a tag if the water is really harmful hazard=poison (in the sense of water contaminated permanently, for example: salt, heavy metals, radiation, chemicals) Regard Slavo
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