That’s a fake rule tacked onto English in imitation of Latin from Romeaboos in the Enlightenment, and it’s only a rule in Latin because it doesn’t make grammatical sense, unlike in English. It hasn’t been taken seriously since the 20th century, except by half-educated pedants.
Many grammatical rules exist to clarify meaning and changing them loses precision of language, but regardless, no one ever actually accepted that rule but stuffy wannabes who weren’t even good at the thing they were being stuffy about.
That’s a fake rule tacked onto English in imitation of Latin from Romeaboos in the Enlightenment, and it’s only a rule in Latin because it doesn’t make grammatical sense, unlike in English. It hasn’t been taken seriously since the 20th century, except by half-educated pedants.
I’m pretty sure what makes language rules valid is whatever social acceptance of those rules is.
Many grammatical rules exist to clarify meaning and changing them loses precision of language, but regardless, no one ever actually accepted that rule but stuffy wannabes who weren’t even good at the thing they were being stuffy about.