I'm just trying to point out that you were extolling the virtues of touchscreens, when really it seems like you're posting examples of how great a stylus is instead. I think they're great too and it's why I have the Pencil and an iPad Pro (and a Wacom too), but I definitely don't think that's a good feature to build into the current MBP screen. Unless your laptop is a 2-in-1 that can fold over itself, I don't think having to reach to the screen over the keyboard in front of you is great UX.
Now what would be pretty nice is if Apple had Pencil support on the giant trackpad so you could use that instead of the screen (like how a Wacom works). I think this could happen down the line in a future revision.