The one that I always get a giggle at - because I’m sure it would give Dick conniptions
I don't see what's funny about a CTAF call on Area...
In level flight, opposite direction aircraft are separated by the cruising level rules (would have been nice to hit someone at 89° instead of 179° but, whatever...). IFR will be making a pre-descent radio call, which will alert VFR. IFR also make departure calls, which also alert VFR. These calls, of course, are made on the frequencies for the FIAs marked on the charts, which are being monitored by VFR as pointed out by The Love Doctor.
While a VFR may not
have to also make these calls, if they do not, they are an idiot, and are endangering themselves and others.