Somebody asked me what to do about the fact that the live meteo within FS2020 may not match the actual weather nor the reported meteo. That’s the answer I gave:
Actually, even if the weather in Sim doesn’t match the reality so does the TAF (the meteo previsions for aircrafts). I mean, you check your METAR and TAF in real life, and when you fly you see that it doesn’t really match. Well I would say do the same here, take the meteo briefing and know it may not match, therefore be prepared about some… surprises 
From the info I gathered they should (or have) integrate information from meteoblue: meteoblue weather in new Microsoft Flight Simulator2020 - meteoblue
That may in the long term improve the situation.
If somebody knows where the current live meteo is taken, please let us know!