At least for me, achieving blind touch typing has been much easier with Dvorak than with Qwerty.

I have used Qwerty for decades, but I was still looking from time to time at the keyboard. After switching to Dvorak on a Qwerty marked keyboard, I have never needed to look at the keyboard again, so there is no point in having a Dvorak-marked keyboard when a standard keyboard is fine.

So a good ergonomic keyboard should be used, but how the keys are marked should not matter.