This whole thing reminds me of dealing with thick airline storemen as in: Me: "Give me the spare Thronomister!". zzstoreman: "But if I give it to you, I won't have a spare!".
i can see the necessity of the CASA procedure for any aircraft in controlled airspace since scheduling and prioritization is obviously an issue.
But to apply it as a blanket measure to light aircraft operating into uncontrolled airports is overkill.