BVocal clients are shown how to aspire to dialect/accent free, Standard American Pronunciation.  But language constantly changes.  And is talking about standards in communication somehow classist?  As your personal coach, I’ll always offer you the range of possible pronunciations and tell you honestly how some pronunciations might be judged.  You make informed choices according to your style and your audience, image and communication needs.  Most important is speaking with a natural, released vocal tone and clear diction.  If changes in English interest you, check out this article from The Guardian.  Fascinating.