@ Walnut ... Nail/Head/Hit. Unfortunately, nobody has yet come up with a credible, wide-ranging, affordable detection system that will allow every airfield/airport in Europe to have the equivalent of a Metar.
In fact, there's almost no data gathering capability at all, especially when considering the 3-dimesional, multi-layered threat from ash.
The last few miles on final approach [related to landing minima] is different from having every airway, holding pattern, TMA and airfield accurately measured for ash at every intermediate level up to FL360.