It kinda is a top issue.
see: METAR keeps disrupting the weather/ bugged weather/Cumulus/CB clouds only/no medium to high cloud coverage - #1424 by JustEmperor4724
What you’re noticing here is the absurd detrimental results that occur since the misbegotten addition of Metar Blending - It used to be that MSFS could render cloud fronts significantly better than it has done since SU7.
This is a sad state of affairs and there are a number of players that have been wholly unable to enjoy the sim from frustration over this.
You are correct that it should be considered the single greatest issue in the sim. All other bugs of comparable severity can either be modded away or are rare enough that they really don’t detract as much from the experience*.
*CTDs, for instance, happen only occasionally. So even if they’re “really bad” as far as bugs go, they aren’t a consistently degrading factor like this has been. Other major flaws, like the complete disregard for type-matching of Live Traffic aircraft, are all things that we can often laugh away, if not fix ourselves with clever modding.
The Weather Downgrade Problem, however, is not so easily dismissed. It cannot be fixed by modders due to the SDK’s full weather lockdown, nor is it sufficiently inconsequential that can it be tolerated, even in jest. It is just too sad.
That puts this giant gorilla of a monkey entirely on Asobo’s back.