@esther
My DSLR has a touchscreen. There are physical controls for using every aspect of the camera and I always use them.
But. The touchscreen *is* useful when you want direct spatial control. You review an image, so you zoom in and out and move around to look at details. You select shots on screen to delete. You use live view and select the point of focus. That is genuinely useful.
It's usually not the best input system. But occasionally it can be.