"Navigating is necessary, living is not necessary" (Os Lusíadas, Camões – classic Portuguese writer).
Speaking, listening, reading or writing... This you can do alone and with relative accuracy.
But understanding the reader and being understood by him, dialoguing with him, is different from the act of mere writing. It takes the version of the person who reads it. There is a convergence of versions to make sense, or it doesn't happen.
Talking, that is, pouring common meanings, varies according to the relational context. Speaking, listening, writing and reading are tools. Chatting is a relational practice, not a tool. As human beings, we learn to relate to each other. And by living together, we talked. And talking we understand each other.