Why is grammar not studied as much in schools as it was before?

Grammar requires laws and an order with the words that it uses. The words that it uses must have a standardized meaning. These days, it is customary for the beguiled and the bereft-of-reason to make up meanings for any word that they stumble upon. If we do not use standardized dictionaries and meanings for words, grammar and syntax fall into disarray and communication becomes wholly ineffective.