Who doesn't know kakashi in the Naruto series ? yes, this teacher with a mouth and eye cover and white hair seems to be a very iconic figure for the journey of the main character, Naruto, to achieve his goal of becoming a hokage.
Well kakashi is actually described as a very proficient and genius teacher, an accurate level of analysis and able to make backup plans when he is on a mission that is not in his favor.
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Making himself recognized as one of the genius ninja in Konoha, but did you know that kakashi has a sharingan eye in his left eye ? so the eye is actually the last parting gift from one of his best friends, Obito.
Now on his journey, kakashi is often seen using his sharingan eye in various missions, making him nicknamed kakashi the copycat, that's because kakashi always uses the basic sharingan tomoe 2 base (slow movement) to see the reflexes of other shinobi in doing hand seal chanting.
However, the most interesting thing about the sharingan's power is when the sharingan has reached the mangekyou stage, where kakashi can use the sharingan's eyes to teleport an object he sees whatever it is including living things into a vacuum dimension that has been created, and the teleportation technique is called "KAMUI".
Now even more surprisingly, at the end of Kakashi's journey to bring Naruto to the title of hokage, he met his best friend who he thought had died crushed by a stone in the battlefield when he was young.
Here obito has been disguised as a masked man and it can also be seen that the fighting style obito has been using so far is to make himself penetrate objects using kamui, the same teleportation technique used by kakashi.
But the difference is, obito is able to penetrate any object that wants to hit him while kakashi cannot do it and can only transfer the object in front of him to the kamui dimension via long distance or short distance, well actually why does that happen ? why can't kakashi bring himself into the kamui dimension or penetrate objects like obito does ?
Well this time i will explain some opinion assumptions that I have compiled into 3 framework points why Kakashi cannot do it even though he is dubbed the genius ninja in Konoha village, so what are they ? Let's discuss together below.
1. Lack of Chakra Supply to Do It + Draining a lot of Energy
This reason is reinforced when kakashi first used kamui to eliminate one deidara arm, it was clear that he was a little overwhelmed and the absorption of kamui he did was not as fast as obito.
That's because kakashi gets tired easily in using the sharingan and the chakra he has is insufficient to use kamui continuously, now with this weakness, kakashi very rarely we see using this kamui technique against strong enemies, usually he will use plan B where he tag teams with other konoha shinobi to fight stronger enemies.
2. Kakashi Never Knew That KAMUI Could Be Expanded Further Like What Obito Did
This is clearly seen when kakashi first learns that the power of his eyes is equal to that of the masked man's (just before he learns that it's obito) during the duel in the final battle of the fourth shinobi.
Imagine, during his journey and by the time he met obito in mask mode (before the declaration of the great battle of the 5 kage), obito had actually met kakashi twice and showed kakashi his techniques.
However, Kakashi at that time still did not know that his eyes and the eyes of the masked man were the same, it was because the masked man aka Obito always left without a fight.
Now after the 4th ninja world war erupted and he learned that the masked man was obito, he then tried to learn kamui's techniques further while fighting his own best friend even though they had both gone through different paths.
Aided by a little extra kurama chakra, he was able to get back out of the kamui dimension and ended when obito left him in the kamui dimension and obito went on his second rampage to become a juubi jinchuriki.
Then shortly after his defeat, kakashi managed to return to the earth dimension and prepare to kill obito, now from here we can see that kakashi has begun to understand how the kamui technique works.
Conclusion
Well maybe these 2 reasons are the most compelling reasons why kakashi can't do it, not other reasons such as kakashi and obito's eyes are different, to be honest the strength of their eyes is the same, obito can go in and out of the kamui dimension why can't kakashi ? even madara who has removed kakashi's left sharingan eye can go to the kamui dimension to meet obito.
In the ending when kakashi gets 2 complete kamui eyes and is able to awaken susanoo, it appears that kakashi can penetrate objects, where the kaguya needle pierces his stomach, it is not the help of obito's right eye, but he has obtained unlimited rikudo chakra through obito's intermediary with a slightly shorter time frame, of course he is able to use penetrating techniques like obito did so far.
Now from there alone it can be explained that kakashi can go to the kamui dimension easily, then for those of you who say, "When did he learn how to transfer one part of his body to the kamui dimension?"
Since he learned how the kamui technique works when fighting obito, remember, kakashi is not like tenzo or kinoe or what we know as the careless "YAMATO", kakashi is a very genius young jounin where he can analyze every jutsu and can apply the jutsu if he has enough chakra supply, so it is easy for kakashi to do it.
And if anyone asks "obito's right eye and kakashi's left eye are different, obito's right eye is specialized for short distances and kakash's left eye is specialized for long distances".
If so, the scene of kakashi recognizing 2 objects, namely the rasengan that is still burning from the cut of his teacher's hand, namely minato, which was broken off due to madara aiming at his chest and the nails shot by pain can be recognized by kakashi easily.
Whereas if you say obito's right eye is short-range, obito should not be able to cancel kakashi's kamui technique from a considerable distance when kakashi wants to try to sever the head of the gedo statue, the reason why he always holds the enemy when he wants to kamui him is so that the enemy cannot easily escape during the kamui process.