I was banging about the same for some time so thank you for putting it here. What is more, the meteoblue models work based on fronts and not metars, so its the first time in a sim that you can fly around a front, this was impossible with a metar depiction saying scattered clouds and just randomnly drawing clouds in an area which was totally unrealistic, furthermore, outside the metar areas just were interpolations not realistic at all but for simmers used to be the norm.
Metars are just aproximations but flight sims used it to precisely depict the weather, wind 10k from 90degrees was exactly what you found in your approach, nothing closer from what I find when I fly in real life and get a metar that may been there for the last 40 minutes as if weather was static. Any real pilot during planning will look for the fronts and wind maps rather than simple querying metars… real conditions are usually broadcasted by towers, information centers or just the airfield radio on your request.
I think at the macro level as you explained the weather system works really well and it will be very difficult for a 3rd party to bring that info to the sim unless you get licenced info from weatherchannel and the likes and unless the devs come with a different model they will bring the old metar/interpolation models to MSFS which from my point of view is totally dated.
Asobo needs to work on the micro level, wind depiction and some other mismatches from the “live” perspective (including ATIS), dew points and visibility and pressure variations and they acknowledged that, I hope with future releases this will be improved.
As for planning, I starting to relay more in the meteoblue website in my flight planning to compensate the old metar approaches.