[manquer]

It comes partly from the language, bureaucracy uses and expects in communication, given India's socialist history , weak market place pre 92 and strong presence of government owned businesses even today , it likely many of the their parents and grandparents worked in the bureaucracy, so it also learnt and home and also schools are poor at teaching soft skills like written communication or anything which won't help you ace exams and get a job.

It is also partly from workplace culture and what their mentors and bosses did when they were junior, somewhat akin to the polite language you hear in the U.S. South. You can pick up mannerisms easily, when you are not sure what is the right way to behave.