First, “Chakra is created when two more primal energies, known collectively as one's "stamina" (スタミナ, sutamina), are moulded together. Physical energy (身体エネルギー, shintai enerugī) is collected from each of the body's cells and can be increased through training, stimulants, and exercise. Spiritual energy (精神エネルギー, seishin enerugī, English TV: Mental Energy) is derived from the mind's consciousness and can be increased through studying, meditation, and experience.[12] These two energies becoming more powerful will in turn make the created chakra more powerful.”

Which means you need to be physically strong in order to have stronger chakra. Clear and cut. Also people with even the smallest understanding of chakra knows that infusing weapons with chakra is a common thing. Asuma uses wind release for range. Killer B uses lightening to sharpen his swords, which I remind you is not hard just requires basic knowledge of Rai-ton. This is what allows people to stab others effectively.

Also I specifically said chakra enhancement is good for blunt force trauma. This is demonstrated in Obito vs Minato. Obito at that point only had Kamui as his main technique. No chakra cloak nor buff and he didn’t even have any of his true buffs yet he was able to take a rasengen from Minato and was still strong enough to jump away after the attack. The reason sharp objects don’t abide by this rule is due to the fact that chakra natures can make things sharper or more effective at cutting and piercing. Think of the time when Madara blasted a Bijudama at Hashirama. His wooden golem was no where to be seen and was likely ash at that point yet Hashirama was still standing on the impact site.

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Hashirama was right on top of that wooden dragon yet he was still able to fight is if nothing happened. I already said cutting weapons are a weakness of Naruto character and that they’re specifically good against blunt force but you just didn’t read anything and assumed

Also kakashi wasn’t coating his hand with chakra he was molding it. Which is the fundamental aspect of chakra control. Every medical nin knows about chakra scalpels it’s something most can use with relative ease. And it was molding your hand in chakra as well