Second gripe is precisely its main selling point - that it can change based on context. I don't want my keyboard changing. I don't want to have to look down to operate my laptop, it breaks the flow and slows me down. I had 2 laptops with the Touch Bar. I tried every software for customising it. BTT, MTBMR (or whatever it's called), and at least one other. I always eventually fix them with the few buttons I use (no sliders): volume/mute, screen brightness, keyboard backlight.
Then, there's also the fact that you can't adjust its brightness or turn it off, and it's always emitting the full spectrum of light, which I find uncomfortable in the dark or late in the day. Granted, this is a smaller thing which is why it's at the bottom but it builds up the list of annoyances.
Edit: just remembered another one - it can freeze. Most of the time it can be fixed by killing a process. Other times, you need to reboot the computer.
Not too worried about my laptop being killed though, they screwed the keyboard up so hard it's essentially dead anyway. Have to take it to the Apple Care center to have it revived again sometime soon because I've got 3 sticky keys that won't unstick.