The fear is based on the already significant interference caused by consumer devices in other bands. 5G network infrastructure is likely better controlled, but

The fear is based on the already significant interference caused by consumer devices in other bands. 5G network infrastructure is likely better controlled, but doing so requires good regulation. There is some possibility that the 5G systems could actually be used to measure some atmospheric properties, similar to the way Navstar GPS L1/L2 signals are analyzed, but since that isn't a requirement of the 5G spec/regulations, it won't be baked in.