And Layout trumps the switch type when it comes to actually USING a keyboard.
Untrue. A good typist can get used to any format given that it has most of the keys in the same places. I could still type the same speed on QWERTZ as I could on QWERTY a couple of years ago. and now whichever keyboard layout I use, I can easily manage 135+ on RD. On Reds, though, I couldn't surpass 130 more than once in ten tries.
Switch >>> Layout
well, you have 2 thoughts there.
Good user can "be fast/ proficient" on any layout.
Good user can "be fast/ proficient" on any switch. (you personally can do within 5% between 2 switches)
My point is that, no matter HOW GOOD, the user is... Will he be "comfortable" while using his keyboard.
Given broad shoulders on most males.. it's impossible to be comfortable on a standard keyboard..
____you have to bring your hands so close together and compress your chest while typing..
____Alternatively, you can keep your chest open, but you'd have to lift your shoulder slightly and elbow upwards to get your hand into keyboarding position on staggered qwerty..
I don't disagree with the points you made...
My point is separate, ergonomics is more important for prolonged keyboard usage.