I used to work for a company that had no checklist and nearly no callouts while the aircraft was in movement. The only FMA callout was a new altitude, apart from that nothing was called out. All in all it was a very pleasant and good way to operate. Later it was changed to the Airbus OEM procedures including full FMA callouts, a set of SOPs used for their lower cost in publishing manuals, not for a better use or safety case.