My previous work provided laptop had a touchscreen and I miss it (for the record, the screen didn't fold 180). It was useful about once a week and I completely forgot about it the rest of the time.

Two primary use cases. Sitting on the train with the laptop in my actual lap it was often more convenient to reach for the screen instead of the trackpad, especially when I had someone sitting next to me on the right and I didn't want to stab them in their ribcage with my elbow so I could reach the trackpad. Second use case was often scrolling while reading, for some reason (phone-scrolling-indoctrination I guess) it felt natural to scroll using finger on screen.

The screen was never my primary pointing device but it was always an option. I think it was annoying a handful of times during the two years I had it, you point at something on the screen and end up clicking something.