Low stance Ki Pulse dodging was indeed more or less overpowered in the alpha build, but it's something that
could've easily been salvaged with a tweak or two to bring it down a notch while retaining what made it a fun mechanic. The way Team Ninja handled the Flying Swallow in Ninja Gaiden would be a good example of what they ought to be doing; rather than remove it outright in Black, they lowered its potency as well as changed up enemy behaviour to directly counter instances of it being spammed. Still a strong technique in Black under the right conditions, but no longer the one-beats-all manoeuvre it used to be.
Moving it over to High Stance is just a very poor incentive for reasons we already outlined on top of the so-called upside being only a difference of a single button press. It screams 'slapdash addition' plus they could've added a more logical reward for it that benefits its offensive prowess rather than pointlessly improving something irrelevant in the grand scheme of it all.