The grammatical phenomena of the English language mostly exist under the radar, invisible to the people who produce them. We use language completely unconscious of the intricacies involved.
A startling recent exception has surfaced over the past decade. In America we are in the midst of a cultural upheaval in the use of language. The youth of our country have boldly pushed forth a conception of language, rupturing the traditions of their parents and grandparents. They have exercised agency over a normally completely inflexible grammatical system. It appears that they have taken control of English grammar! I am talking about how the young people of today choose the pronouns that they use to refer to themselves.