"interpreting its display is a bit of a black art." - "It is akin to a blind man with a cane;" - "For instance, the radar mostly detects rain and hail – and if that first layer of storm cells was particularly heavy, it might have acted like a curtain – hiding the reinforcements from radar beams."
You can't know what's inside a walled garden or know how big it is just by looking at one side of the outside walls, you need something that allows a top view.
A professional meteorologist on the ground who can interpret and summarize the relevant information is of way more use.
Like it's said you might loose contact with any ground station when flying in the middle of nowhere or you might lose imaging data of the storm. So both should be there to provide a better standard than the current limited info of printed weather maps in preflight briefings, especially for long flights.