I fly behing a WX500 displaying on a KMD550 MFD.
The azimuth data appears accurate.
The range data appears overly conservative, often showing say 20nm when the bad stuff is at about 50nm.
I know of pilots who fly in IMC, with embedded CBs, and they find it good enough for that. I assume these pilots do not fly with passengers
But I can see this strategy works if you want to avoid flying into a really nasty active CB.