How exactly would adcoc help Luffy when he can’t touch Kizaru?
He literally has not touched him without a sneak attack yet.
He has indeed been touching him. Kizaru is seen blocking his attacks in the previous chapter.
This argument would make sense if what we saw was Kizaru dancing around every single attack Luffy was throwing at him. As long as the strike makes physical contact, even if blocked, putting more power behind it with aCoC is a sensible thing to do... Overpowering guards is a thing.
To me, either Oda straight up doesn't care about visually representing haki techniques being used (there is an argument to be made for that) or Luffy is legit not using it for whatever reason that will hopefuly be made clear at some point...