Why a pinky key rather than a thumb key? The HHKB layout makes you travel farther and less intuitively to find the Fn key, and you have to use a weak finger. It does make it easy to combine shift with Fn (ring finger and pinky), but that's the only advantage that pops out at me. The spacebar-adjacent Fn key on V60, Pure, and others means both your thumb and your other fingers travel less far to operate an arrow-home-end cluster; you're using a strong finger; you can still easily combine shift with Fn (thumb and pinky); and your fingers are nearer your original hand placement when you're done using the function layer. I know that the HHKB comes out of much study, so I am hesitant simply to throw over the decision of Dr. Wada. The default "right thumb key" on the HHKB is a right Windows key, though; this is duplicated on the left and is, at least for me, a very low-use key to begin with. Certainly Fn takes precedence here. For those who have used both set-ups, is there something about the pinky key you prefer? Of course you can "get used to it," but does it have any natural advantage in efficiency or ease of use, apart from any barrier you can compensate for with muscle memory? I can't help thinking that this trademark of the HHKB is some sort of historical mistake now regarded as gospel.
