How can you the communication of your words is accurate without feedback of others expressing to you what was clear and unclear? Like, damn, do you also argue

How can you the communication of your words is accurate without feedback of others expressing to you what was clear and unclear? Like, damn, do you also argue that proper grammar and sentence structure is just "an average of what the masses like to read"? Because yes, that's what English is, its an average of what the masses communicate ideas with, within the mass of people who speak English.