Should subtitles use modern names for films made in the 1950's?

 Bollywood

                                                                  Hindi Cinema

My passion for films from India for the period from 1940 -1990 raises a question.

I have found subtitles refer to cities by their names since Independence from the Raj; 1949. To me, it is not a problem, I know which cities changed their name Delhi is now Mumbai; Calcutta is Kolkata, and Madras became Chennai after Independence.

The issue is should the modern names be used for films made before 1949, or should modern names be used for the current audience? The truth is, the modern Bollywood viewers have little interest in old movies.

I prefer to watch the old movies as they are films with music, rather than musicals with a little story as films since 1990 have been; I also abhor the sexist attitude of the cinema in India