I personally don't have use for such a feature, but I'm sure the site owners will consider it. In the meantime, as a workaround, you can use the "Home" key on your PC keyboard (I believe "Command—Up Arrow" has the same function on Macs), or on an iOS device, tap (once if the URL/search bar is already "expanded", twice if the bar is currently collapsed) near the top edge of the screen to quickly return to the top of any page.
Yes, Command up arrow, but that is two keys I need to press, and move my hand away from the mouse. When I'm relaxed, legs crossed, a glass of wine on my left hand, clicking and scrolling here and there (my typical Sunday afternoon), I want to move around with just my mouse, and is a bit awkward to press a key (or two) just to go all the way up after a long article. If is a short one I don't mind, but one like the recent Review of Eight Papers, from Mark Segal, is annoying having to scroll all the way up.
Is it laziness, maybe, but is more of comfort than anything else. Besides, is an easy fix, just adding a simple link to <a href="#top">Go Top</a> In fact, there are currently basic JQuery libraries, that allow you to have a floating back to top link, which is nice, when you don't even want to finish the article, but want to go someplace else.
Here is a nice read
here about website design basics, and when to use or not the back to top links.