A mega nerd for pulling out a 7 by 6 inch touchpad with a pen next to your laptop? They're not talking about a full fat Wacom tablet, and besides, it's really not that hard to write on a screen vs a tablet, in some cases even better because your hands don't cover parts of it up (I have both an iPad with a pencil and a Wacom).
Plus on macOS you can easily use note taking apps with the Wacom touchpad that then digitize the text to make it searchable.
Does the Wacom show the actual result of the writing, or do you need to look at the screen? This feels like a bad solution to needing an electronic notepad.