Its all them ruddy microlighters who don't bother to get a radio licence and haven't a clue what they're doing
The chaps who are radio shy tend to avoid CAS altogether. In my experience, microlighters who do talk on the radio seem to be generally more concise than some other GA types. The number of times I've been waiting to make a call while some eejit uhms and aahs his way through his life story...
Good thing I fly at 50kts!