At any rate, I don't need to draw a line between those homo that spoke languages and those that did not. I grant that the former could not be understood by the latter. I just don't think the same goes for languages and 'meta-languages'.

Ah. To me language is just a meta-grunt. That's why I don't think it's different from the next level up. But I guess I don't have any better arguments than those I have already made and they are clearly not convincing. So I will stop here.

You might think they just mistook an instrumental goal ('serve God') for a terminal goal, when actually they wanted to 'do good' all along.

Right, you might. Except they may not even had the vocabulary to explain that underlying terminal goal. In this example my interpretation would be that their terminal goal evolved rather than was clarified. Again, I don't have any better argument, so I will leave it at that.