I still have physical f-keys, and every time I use my gf's touchbar macbook, I realize I have to look at the touchbar just to do anything, like modify the volume or change the brightness. I run into this every time I use it when I just want to make quick volume adjustments. And it takes multiple taps to get things done that used to take a single button press. Also, I immediately missed global media playback controls.

It's just a showstopper for a lot of us that it's another screen you have to look at. I don't want my eyes to leave the main screen. It's like if they tried to turn the trackpad into a screen: no matter how much functionality it might have, it's still somewhere I don't want to have to look when I'm using a computer.

I also was amazed at how unused it was. You probably named the only apps that use the touchbar because nothing on her computer did. And if they did, it was just cloned UI of UI that the main screen already had. I think the only useful usecase I've noticed is that the touchbar will show the url of the current video when you fullscreen it, if I want to damn it with faint praise.