I have a neighbor who only uses the touchscreen on their ThinkPad, except when they have to type something.
The other day I stopped by to help them troubleshoot a problem, and they had to do a password reset.
They touched the Old Password field on the screen and typed in their old password on the keyboard. They touched New Password on the screen and typed in the new one. Of course then they had to touch the second New Password field on the screen and enter it again on the keyboard. Finally they reached up to touch the OK button on the screen.
I mentioned that they could avoid going back and forth between screen and keyboard by using the Tab and Enter keys. They asked, "What are those?" I pointed them out on the keyboard and explained what they do.
We will see if the message got through. Hopefully with some gentle encouragement over time, it will.
My real point is that yes, some people do use touchscreen laptops.