So I couldn't help but notice that the Netherlands and Germany are missing from the Roman Empire on Numista's world map.

There are ruins of Roman buildings as well as archaeological evidence in various cities in Germany such as in Trier, Speyer, Cologne, Ladenburg, Heidelberg and Aachen to name a few.
I'm less knowledgeable on Dutch history, but I'm certain that the southern parts of the country also have evidence of Roman settlement as well.
Would it be worth adding those countries into the Roman Empire on the map?