Strangely I heard the same theory yesterday, never gave it a second thought. Love all the GPS info and the ability to get places but I always have put Weather first. GPS is just my backup for getting to a place.
Therefore for me, I may stick my nose into the sky, but never venture farther than its safe to fly. Since Im in EMS we usually always launch but have the option of cancelling anytime things get dicey. GPS is also helpful then if I need to know a place I can divert. Worse case for me if I did get in over my head, is to just sit it down, get on the sat phone and say we will be here till its better. Our missions are rarely over 100-150 miles so the geography and weather patterns are pretty well known.