Read the last part of my comment again. I didn’t miss it. If two speakers agree on a new word and its meaning to the point it becomes adopted by a wider population of speakers, guess what, it becomes a standard word. By how you’re describing it, dictionaries are the progenitors of language. You have that backwards. Dictionaries are records of the language and what words are being used.

The only languages that do not behave this way are dead languages.