> One simple argument is that language is NOT a magical reasoning substance in itself, but a communication medium.

I'm wildly impressed by how many people think language is thinking. My best guess is they're conflating inner speech with thinking. But if you can't figure out that the words you vocalize aren't an isomorphic representation of the things you try to convey, well... It's hard for me to believe you've spent enough time thinking about what it means to think. Miscommunication is quite common and so there's sufficient feedback to learn this without being explicitly taught. Then again, there are people in the world that I fear...