exactly what canonikon fans claimed about eyeAF:
"Sucks the skill out of it"
"People have been good taking picture for XX years without it etc"
etc etc
till they got it in their cameras or a bunch of them moved to Sony for it after they realised how useful it was.
If you think focus stacking is "blend a couple of images in photoshop" you are seriously mistaken.
I have spent £6K on that camera and I am competent enough to focus stack without that feature just as I was competent enough to get people in focus without eye AF.
That is really a not a good reason not to provide a feature.
Why not just shoot with a manual lenses then, that requires a lot of skill

there is no skill or fun in wasting time in post processing because your camera couldn't perform a certain function.