At our company we have Boeing and Airbus...we do not call out any FMA changes. Our callouts concern only gear and flap configuation changes, additionally we call out all altitude changes, plus 2 and 1 to go. I our company philosphy is to call out deviations from the norm that are recognized on the FMA, eg when it goes to vertical speed vs open climb or descent. Since I have never worked for a company that calls out all FMA changes...its difficult for me to support one side or the other. However, IMHO I would think that after a while the callouts would become like background chatter...thus being ignored.