Creampuff, my point is in response to
There are frequencies used by Air Traffic Controllers to provide services, including Class G FIA (Flight Information Area) frequencies (otherwise known as "Area" frequencies). These are not "control" frequencies, where separation services are provided. It is entirely appropriate - and required in AIP - to use FIA frequencies for their intended purpose.
ATC sectors are generally split according to service provision. They are, however, generally combined so that an ATC controlling CTA (remember that one?) also has the Class G frequencies merged. In a headset, there is no differentiation. If you think your calls on the Class G area frequency don't potentially affect comms in CTA you are wrong.