Main_dog, I agree that the odd confirm has its place but when every second pilot from the sub-continent uses it, it starts to grate on your nuts a bit.
I have no proof but I think very few sub-continental crews make use of their headset until very late in the flight. Clearly evidenced by the numerous times one receives feedback on the freq. It should be SOP to wear a headset from TOD until park brake and park brake to TOC.