Superfluous "support" calls under banner of Situational Awareness.
Among other manfacturers, Boeing provide recommended support calls during approch and landing. It is a good bet that the company has received advice from its legal people before recommending these support calls in the FCTM or other sister publications. Before committing to print its is also certain that Boeing Operations or Flight Standards people would have looked closely at the relevance of each call and decided it was important to use them.
Most operators then add their own version of "support" calls, almost always far in excess of the Boeing recommendations. Situational Awareness is the usual reason offered for what some may argue as superfluous calls.
One such superfluous call mentioned in some operators manuals is "500 feet - Stabilised." during short final. Another call noted is that of acceleration altitude for clean up after take off. "EFFRA" or engine failure flap retraction altitude" is sung out by the PNF on reaching.
On levelling out at cruise altitude is heard "Flight Level 350 one, two three..." in relation to three altimeters reading the same altitude.
Boeing recommend a call of "500 feet" above airfield elevation on final in VMC. However what is the point of then adding "stabilised" when standard operating procedures already recommend that the aircraft be stabilised by 500 feet. Situational Awareness is a buzz word used to excuse all sorts of superfluous "support" calls. Comment invited.