Rees-Mogg's banned words list wasn't about grammatical accuracy. None of the banned words were grammatically incorrect. It was about his desire to project a particular image in respect of his office.
Yes, and technical grammar correctness often does the same thing.
Language is communication. I could say to someone, 'Gimme that hammer,' and they would know what I wanted. I could also say, 'Would you mind terribly passing me that hammer, please and thank you kindly,' and they would know what I wanted. I could say, 'One is desirous of yonder hammer, pray hand it over,' and they would know what I wanted and think I was an insufferable arse.
Your mode of delivery, otherwise known as register, is a signifier of all kinds of things like audience, genre, class, education and so on. The fundamental message is the same, the register is all the trimmings.
This one of the reasons why there is no single 'correct' English language usage. Much like our constitution, our language is governed by a series of unwritten conventions, styles and traditions. These can and do change over time, like it or lump it.
So go nuts, say I, and split infinitives, live in a doggy dog world, use your chester draws – it's all communication. It's only 'incorrect' if you cannot properly and appropriately convey your meaning to your audience.