So, the dictionary is not a gold-standard.

It is, in fact, the opposite and in very simplified terms, just a book of how people currently pronounce words and their meaning today. Think of it more as a record book for the time it was printed, rather than a rule book; living languages are funny like that.

If you would like to know more, I highly recommend Word by Word written by Kory Stamper, one of the editors for the Merriam-Websters Dictionary.