Because Apple is for "everyone" now and most people are not smart enough to properly optimise their workflow, one of apples greatest products of all time the Magic Mouse, full muli-touch trackpad covered mouse was a precision instrument. Apple even tried to get people to learn to use gestures and at this point most people know the basics, i.e two finger swipe to navigate web pages.
However with a third party app like better touch tool you could do pretty much anything by swiping your fingers, this over a period of years can save you days if not weeks worth of time, make your experience switching tools in photoshop for example quick and seem-less, replacing nearly all keyboard short cuts. To this day, people have no appreciation for how good that product is and even complain about it ergonomics which I never had any issue with.
The touchbar is the same kind of thing, however Apple definitely didnt realise its full potential. Firstly they decided that instead of Up, Down, volume keys there would just be a volume slide and mute button, even though you can customise the toolbar to be like the physical F keys later (Hidden behind a bunch of sub menus for some reason) people dont like this kind of change, when you have decades worth of muscle memory hitting a certain key, this kind of thing really annoys people and its just poor UI/UX design. Secondly the Touch Bar had no haptic feedback, another major fail as after installing a third party app, you realise how much nicer it makes it feel to use. There are also many third party apps that make the touch bar more generally useful like Pok etc, but Apple never tired to make something similar so it just helped extend app functionality only, where it could have done so many cool things, why not have screen saver animation for it, picture in picture type fun, cover view, its literally an OLED display but you never see animation, they should have at least tried to make it fun to help get people to play with it.
So back to the main point, people dont have the patience or knowledge to make use of this kind of technology, im sure the next generation would have been able to find the utility in these kinds of new advances in tech. I really hope Apple see that they really were onto something with the Touch Bar.