From first glance, it might also make sense when one knows that an amenity/building/etc. has a charging point but one can’t necessarily accurately map it’s location (say, if satellite imagery doesn’t yet show it).
Just to note, there was recently a long discussion about the charging stations. The result was an approved proposal to define a new tag of man_made=charging_point to better map an individual charging point.
I wonder if charging_point=yes might therefore be more consistent?
Though I think the idea is that man_made=charge_point should always be located inside an amenity=charging_station so I’m not too sure! Perhaps charging_station=yes is more adaptable in case an amenity/building/etc has multiple chargers available.