EI Premier:
Of course, however:
I think that perhaps the industry would be better served right now with dual use of real time analysis and NWP modelling, as opposed to ridigly adhering to the NWP modelling. A mix of both will yield the best outcome, whilst still maintaining safety for all.
Safety trumps all other factors, but it is equally important to ensure that when viable - flight operations should continue.
You may be right. My suspicion (and I know nothing about this) though is that the VAAC regulations will be worldwide and based on ICAO rules or guidance, and as with so many things, it may be that regulations haven't yet caught up with technology.
The problem though is that you're trying to forecast for extended periods of time to cover total flight durations, and on a 6 hourly issue period - not just one hour to the next.