You really think Oda believes a whack to the head makes a difference
Ragnarok to stomach:
KOd like fodder
Later, Drunk Mode Ragnarok to head
No KO
"Critical head shots" are literal headcanons.

It's either you're durable enough to take it or you're not.
Wano Law shits on WCI G4 Luffy in every category including durability, feats are feats.
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YC2 Queen got KOd by two base hits from brainless nerfed O-Lin.
Wano Law took multiple (>>>>2) punches from a 1-year life powered up BM using her CoA.