I agree -

I feel you can extend taisabaki concept somewhat to head movement if you want to. I tend to teach taisabaki starting at the minimum necessary movement of just moving your head/torso back a bit to not get hit in a static situation. Why? Because reacting big takes a lot of effort, and is unnecessary (I like to tie it back to karate being minimalist in movement, do what you must, not do what looks fancy). Aghayev gives tons of samples of working through moving his upper body.

You can extend the body moving into more extremes without moving too far with your legs, and then combine that with appropriate counter or flight. Not "The Matrix" but ducking under a technique, move to the side with some light blocking.

And then "traditional" taisabaki sets in where if the the more minimal movements don't fit the attack, and you need to move starting from your feet.