I find Xah Lee's arguments unconvincing.

On a typical PC keyboard of today, the Caps Lock is the most difficult modifier key to press, and is pressed by the weakest finger pinky.</quote>

On keyboards I've encountered Caps Lock is right on the left of an A key on the home row - it is easy to type it (and certainly easier than the Left Ctrl).

It makes the left pinky do 2 pinkies's work.</quote>

You press Caps Lock instead of Left Ctrl - the same work.

It forces the left hand to strain into spider legs positions, or forces your right hand to flies about wildly if the letter key is near the middle of the keyboard (e.g. T, G, B).</quote>

The standard practice is to press the Right Ctrl (right hand) + t,g,b (left hand) - no flying.

It renders many Control-‹key› spots void, since now with only one pinky many otherwise good Ctrl-‹key› spots are hard to use.</quote>

The Right Ctrl stays therefore there is no need to use only one pinky. The most frequently used Ctrl-<key> combinations in Emacs is point movement commands. Caps Lock makes it easier to type some of them e.g., C-n/p.

The left hand now constantly shift from home position.</quote>

See my comment to the first quote.