I checked several airports where reported RVR was below 200 m. Not a single Airport simulated the visibility correct. I am a real airline pilot and know how low vis operations has to look like. With RVRs of 200 m you really have to taxi slowly and stick to the runway lights. I never saw this within FS2020 (Fsx used real fog)
Maybe it can be simulated, but live weather doesnt do it correct regarding current metars