Those of you who fly the LLR regularly may be fine, but for those of us flying it occasionally, working out where you are, not infringing MAN airspace, and also keeping a very good lookout, amounts to quite a high workload - and if the vis is marginal too...
What's the problem with a dedicated frequency, with aircraft just giving position reports? That's what happens for helicopter traffic in Los Angeles, where the high traffic volume and frequent smog makes see and avoid difficult. Does it cost just to have an unmanned frequency?