My wife and kids touch their screens all the time. I often reach over my wife's shoulder and tap a button or something on the screen rather than reaching for the trackpad.
It may not be that useful for your particular use case but that doesn't mean it's not useful for others.
This is one of those things that once you use it you wonder why it's not more common. Especially for scrolling having touch on a laptop is very convenient and you get used to it quickly it becomes muscle memory to the point that you start touching non touch enabled laptops.
Had a lenovo yoga with touchscreen and replaced it with a thinkpad, until I switched I hadn't realised how much I was using the touchscreen before.
I used a pixelbook with Android apps as a daily driver for a couple years. I wouldn't use the touchscreen unless I absolutely had to.
It gunks up the screen and a mouse is just more precise.
I had the option of "tablet mode" and the pixelbook is pretty much the thinnest notebook/tablet on the market, but even it's 12" size is just too big to hold in "tablet mode" for extended periods of time.