Otherwise, you would have to incorporate every possible pronunciation of every word from all parts of the world.
In the UK, for instance, the word "bath" can be pronounced in 2 (if not more) very distinct ways. The pronunciation given in dictionaries, I believe is the one which could be said to sound like "barth". However, a large number of regional accents would pronounce it with the short "a", as in "bat" but with an h at the end.
Student or Learner