The main reason it has this "calming" feature is because it's imperfect. By averaging different, sometimes incompatible font faces the result looks like a letter pressed on a soft paper, with all it's natural imperfections. It looks real.

Somehow I was not aware of Averia and used Old Timey for exact same reasons in the past.

On the other hand, someone here mentioned "Lato", which to me looks exactly how two robots would write holiday postcards to each other.