The behaviour is supposed to follow the human interface guidelines. It used to be fairly clearly conveyed by the controls too (disabled ones where greyed out) but this might be less obvious these days. https://stackoverflow.com/a/23158158
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
The behaviour is supposed to follow the human interface guidelines. It used to be fairly clearly conveyed by the controls too (disabled ones where greyed out) but this might be less obvious these days. https://stackoverflow.com/a/23158158