I concur, Rodrigo. It seems to me that Alex is trying to get a handle on these issues by studying language games, which for him, presumably are transcendent. But like you, Rodrigo, I can't find a sure footing here. I'm not sure how my thinking would change if I were to follow Alex. The social is more understandable.
Language is obviously a cultural product.
So, from, this point of view, when we open our mouths to speak, there are limitations on what we can say and how we will be understood. On the one hand, language, as a cultural product, often seems to have a life of its own. Our words, what we intend to say, somehow is configured by everything said before. Yet, on the other hand, the conversation, which we enter, carries us along virtually assuring that some will find us very persuasive, even if their understanding is at variance with ours. At the same time, our cognitive capacities, our neurological environment, which makes it possible to speak, simultaneously sets limits to our imagination and articulateness.