Overwrit

Not so much, in Dragon Ball there is the concept that using techniques like Kamekameha or Kikohu can temporarily increase the power level.

The problem is that it has things relative to the strength/importance of the corpse, so in Meteor City it's just collecting mostly useless stuff.

As a concept, if he only refers to art as something simpler like music, paintings and so on, he would have no strength, just because he is good at music does not mean he can create almighty sound based jutsu. Anyway, it was seen later that he was a general all-around talent.

Isn't it a bit of a pathetic awakening? Normally awakening quirks become and transform a lot, even the simplest quirk like Tomura's became immensely stronger, increasing the radius and spreading everywhere.

He just said that farming is very difficult, and it depends on which farming world it is, some are not very strong until much later, most in the early farming realms are not much different from a common superhuman.

Bro, literally all he's been in history is the MC tricking his peers to elevate his status, it's what has kept him alive and without attempts at mental intrusion or anything. Aside from the fact that putting everything into chakra doesn't do him any good because it's just chakra, not speed, strength, experience or anything, he'd be in almost the same situation.

Kimetsu with beings that regenerate almost instantaneously and cannot die from anything but the sun and move at sonic speeds:

The problem was that at the time this fanfic had a lot of tags that didn't fit anything.

For a normal body, he has a body without limits, totally out of logic.

Therefore, it is a fight between two people without any absolute advantage as far as the soul is concerned.