Yeah I agree with you. There might be something to the other side of the coin though. For example, a feral human with no language will have “thoughts,” as we both agree. But they will probably be quite different than thoughts from someone with language. Having a word for something has a way of crystallizing a concept. With a lot of those at your disposal you might be capable of more sophisticated thought. It’s really hard to say since we don’t have feral people to study and we couldn’t examine their “thoughts” even if we did.