I'm not sure why people try to say chakra exists in other anime.get with the program people.
Chakra is not ki
Chakra is not reiatsu
Sorry to break it to you but itachi can't "finger genjutsu gg" goku
Chakra is Two energies combined
Spiritual and Physical
If sources are right both Ki and reiatsu are spiritual energies
Normal Narutoverse people did not have chakra when Kaguya genjutsu'd them...thus, having chakra is not required in order to be put in genjutsu.
Why are people so threatened by genjutsu that they have to try and take it away from Nv? Because they know that only Nv has the knowledge to fight against it.
Under the Same token as the often used chakra is not part of another verse argument...the same applies to Narutoverse. The other verse rules do not apply in Narutoverse, so why are Naruto characters forced to Obey them.
Take spirit pressure for example...having a large amount of spirtual power/Yin chakra doesn't 'crush' characters in Nv who don't...or seeing spirits, characters in Narutoverse can see spirits just fine(but since this isn't how the rules in bleach work, people try to apply those rules to Naruto characters and say Humans can't see shinigami and Ninja are humans so...)
Or Fishmen in Op being 10 times stronger than humans...and Tsunade/Naruto/Jubito are humans, thus Arlong is 10 times stronger than them-_-