You are right! 
POI and adresnode were seperate before you made the changes. You just completed the POI without knowing that we use the adressnodes. A lot of POIs in The Hague are still seperate. Everytime we meet a seperate POI we place it om the adressnode (when applicable).
The choice to map POIs on adressnodes was made before my mapping time. But it seems it had to do with preserving history.

Happy mapping.