The issue with street addresses and postcodes is that they can be imprecise and don't lead to an exact entrance especially in large buildings, rural areas, or new builds. Agents writing their own directions can be inaccurate or make assumptions as to how well the visitor knows the area. Apart from that roadworks, accidents etc can play a part.
The what3words app, (iOS, Android) is completely free and you can navigate to any what3words address using Google Maps or Waze as usual. We include the What3Words link on all our listings and it's clickable on our website and Rightmove etc.