The Apple user Interface guide for touch bar shows that touching bar should be used as an extension of the keyboard and touchpad, not the display; Touch bar should not be used to display notifications, messages, scrolling content, static content, or content that causes the user's attention to move away from the main screen.
-Avoid using any animations. Touch Bar is positioned as an extension of the keyboard, and users do not want to see animations on the keyboard.
-Use a tasteful, minimalist color. Overall, the touch bar interface should resemble the physical keyboard.
-In general, touch Bar should not provide action on certain tasks, such as finding, selecting all, canceling selection, copying, pasting, cutting, canceling, redo, new, saving, closing, printing, and exiting.
Obviously, Apple wants developers and users to treat touch bar as an extended keyboard, not as an extended screen.