In many cases the ATC who is monitoring the G frequency is also responsible for separating aircraft in controlled airspace.
In some cases aircraft in G making self announce calls at low level block out calls that they cannot hear that are being made to or from aircraft being separated by ATC. That's why procedures in other modern aviation countries prohibit such calls on ATC separation frequencies.
Or take away the concentration by the ATC where it should be. Look up the BASI report on the breakdown of separation in relation to a 747SP in Queensland a number of years ago. A VFR aircraft making position reports was one of the reasons given for the error.
First a breakdown of separation then a real accident killing people. That's why I would like to know which individual has pushed this.
Come on. Some one must know- send me a private message if you would like!