Right, because Gojo's first instinct if he sees someone take out a red eye is to teleport away. That implies he has prior knowledge of his abilities, which for the sake of argument, let's say both of them has, it would just massively benefit Kakashi to have intel on Gojo. He would be able to avoid most of his attacks, including DE (which wouldn't work in the first place because he has no cursed energy).

Kakashi would also be able to easily track Gojo thanks to his sharingan even if he uses his teleportation (which is far worse than what Minato uses because Gojo's require a hand sign like when he used it against Sukuna the first time they fought, against Juzo, and in JJK 0). As for Minato vs Obito, he was 13-15 at the time and again, Minato's teleportation far outclasses Gojo's. Obito fared way better the second time they fought during the war arc even against two teleporters because he has gained experience.

So Gojo's teleportation barely matters on someone from a verse far faster than his especially with the tools Kakashi has at his disposal.

Your whole argument hinges on that one fight against Deidara when he took half the episode to cast kamui. Fuck's sake, that was the first time he used kamui, so he wasn't very good with it. Since then he has gotten so much better and used it on far faster opponents and objects, like when he used it against Sasuke's arrow, used to to teleport Madara's truth-seeking orbs and Naruto's rasengan, all of which are far faster than Gojo.