Why is drag and drop more popular than click-click in online blitz? There are two ways to move the pieces in interactive interfaces, to drag and drop or to click-click. Drag and drop is by far the more common choice. Why is that given the two advantages of click-click?
1) Click-click avoids making mouse slips in online blitz play.
2) Click-click is easier from the ergonomic point of view.

I have switched to click-click in online blitz very soon after starting to play regularly in order to avoid mouse slips and it works. I am a fast click-click player mostly using a touchpad and see no reason to think that my opponents play faster with their drag and drop technique. But they slip.

Perhaps the answer lies deeply in the psychology of making a move on a real chessboard when there is clearly the moment of taking hold, then an interval of keeping hold of the piece, and then the moment of releasing. Drag and drop instantiates the same psychological experience while click-click has no relation to the original hand movement. Any ideas?
Is there any research/poll that supports your claim for drag&amp;drop being more common choice?

Personally, I use click-click, and most people I know also prefer this option. It's just as fast as drag&amp;drop and it's much less prone to slip, as you already stated. And that's especially true when using smartphone instead of the mouse. :) 

Perhaps, apart from being similar to real-life behavior, drag&amp;drop gets used more when there's GUI that presents it as preferable (although I would say it's a bad design). For example, when you click on a piece, it pops-out/enlarges immediately, so it's somehow more obvious to just drag it; I guess some people don't even bother trying if click-click works at all afterwards.