Creating and maintaining a standard pronunciation is not practical for any language
Language or talks in a language is not a one man’s invention. So many people have contributed and are still contributing for the development of language. Climate, geography and many factors of the place will influence the vocal cords in the matter of sound modulation & sound pattern in a person. More than that, which way one hears the sound, that same way, he develops his talking. Through the advancement in technology, communication devices and globalization, it is getting automatically reduced, up to an extent.
~BABA ALEXANDER NEW DELHI