And seriously, if web browsing is your main use-case, a MBP is overkill.
I don't understand why someone using a laptop would want to scroll by lifting their arm up to the screen, rather than just moving two fingers on the touchpad where their hand is already resting.
Not to mention, having the option to use both certainly doesn't harm anyone.
Isn't that uncomfortable?
Merely taking my hands off the keyboard is enough for them to move out and away, since I have to "swing" them in to use the keyboard to begin with. This leaves them inches from the screen in the best case, and nowhere near the computer in the worse case.
Hmm… if you did that on a new MacBook Pro, wouldn't drifting up the side leave your thumbs somewhere near the Touch Bar? Maybe Apple should add support for scrolling on its edges. Of course, that'd still be a much smaller target than the screen... on the other hand, it would work regardless of window positioning and even with an external monitor.
I'm only speculating, since I don't think I've gotten into that habit myself (not having a touchscreen).
My hands tend to rest on the mouse or table when reading. It's actually quicker and less conscious to 'flick' the screen when reading than to break focus to find a trackpad and scroll that way.