Where there are rules they will be either broken or modified, human nature to do so.
Give me an RPT A/C inbound to a CTAF any day, at least they are more professional at their R/T procedures than others. Some pvt pilots are very switched on without a doubt, you can tell instantly you first hear them either inbound or upon taxiing, sadly a lot make it up they go despite being 'licensed' pilots.
CW
And some RPT are just as bad as some of the worst GA pilots I'veseen, like the Easterns idiot who decided to initiate a 03 RNAV approach when I was already inbound on the 21 NDB in PMQ last week, ending up with us head to head on final, at night, in a B western style showdown with some of the worst and least accurate RT on their part I've ever heard.