Seriously, you reach across the keyboard to touch a screen (well I suppose someone does), as opposed to doing touch on the touchpad that is right there by your fingers already. This isn't windows, the touchpad is very touchy, works like touch only easier and without moving your hands across the screen. I personally tried using a tablet device as a laptop, was so annoyed by having to reach across the keyboard to touch the screen - I got a MBP instead.
Engineering is all about compromise. One thing about touchscreens is that they are generally of lesser quality for the same price, or way more expensive, and use a lot more battery. Maybe that is becoming moot now as 5nm technology and ARM is coming out with way better battery life. But it has not trickled into the reviews I've seen. I prefer a non-smudgy, wide color, sharp, bright screen over touch any day. And I never let children play with my computer - that is for cheap laptops or tablets.
So your point is taken, but I just happen to disagree with you