Personally, I feel as though Apple got it wrong in the HIG. It is a display and it can't be treated as an extension of the keyboard (in a useful manner) given i

Personally, I feel as though Apple got it wrong in the HIG. It is a display and it can't be treated as an extension of the keyboard (in a useful manner) given its lack of tactile differentiation. If Apple doesn't want people to look at it like a display, and the content of it is dynamic such that I don't know what the bar represents, then you can't fulfill the HIG. If Apple had an in-OS feedback mechanism that asked users, once a month, if they found Touch Bar useful or an impediment and then also collected number of keystrokes (opt-in) in that month my guess is the distribution of users who interact with their computer primarily through keyboard input will respond that the Touch Bar is an impediment. Those largely clicking for a majority or interaction would likely find it useful. Either way Apple got it wrong by assuming users would always find it better than giving buyers the option without.