Uchiha Obito's incredible working ability, even enough to pretend to be the mighty Uchihiro Madara, became a burden to Kakashi in his hands. Why?
First of all, naturally, there are too few chakras in Hatake Kakashi. As we all know, Xia Lingen of Hatake Kakashi is a transplant friend in Uchiha Obito's eyes. Kakashi has no internal qi and blood, so Kakashi can't close sharingan at will. Sharingan, which is always on, will continue to consume chakra, which also leads to the absence of chakra in Kakashi duel. Even chakra, who made the complete book of Ninjutsu, needed to be petty, not to mention making a kaleidoscope of saringen's pupils.
Looking back on Uchiha Obito is different. As a descendant of Neiguang, Uchiha Obito has many chakras. In addition, he can turn sharingan off or on at will. Of course, Uchiha Obito could not be confused by the number of chakras.
In addition, if there are enough chakra in Hatake Kakashi, even if sharingan can't be shut down, it can still inspire great lethality. It's like in the fourth Ninja Wars, after Hatake Kakashi got Naruto's Kyubi no Youko chakra, he could not only move larger objects with Shenwei like bijuu, but even enter and leave Shenwei's indoor space, which is not much different from Uchiha Obito's Shenwei.
Secondly, it is well known that Uchiha Obito's kaleidoscope sharingan has not evolved into an eternal kaleidoscope sharingan, so too much application of Shenwei may make people blind. In fact, even because of chakra, Kakashi, who seldom uses Shenwei, has felt the decrease of visual effect since then.
However, Uchiha Obito not only used Shenwei's working ability many times in almost every battle, but even used Shenwei's method to advance. The key to Uchiha Obito's unbridled indulgence in the pupil strength of the kaleidoscope sharingan is that he has transplanted cells between pillars before.
Just like Uchiha Shoko Asahara can improve his metempsychosis at the end of his life after migrating cells between columns. Uchiha Obito, who transplanted cells between pillars, did not improve her metempsychosis, but she also benefited from the free application of the kaleidoscope sharingan. It is not difficult to see that the best partner is the application of inter-column cells and kaleidoscope sharingan. Of course, Uchiha Obito can give full play to Shenwei's higher lethality than Kakashi.
Finally, because Uchiha Obito was taught by Uchihiro Madara, it is well known that sharingan, as the blood line of Uchihiro clan which has been widely circulated for hundreds of years, will be developed and designed by generations of Uchihiro descendants. Xie Yi, Nagi and Isobo, for example, are the energy left by Neiguangzong's pro-doyen.
As a foreigner who got Saringen, Hatake Kakashi not only didn't get the work experience of the Neiguang family of Saringen, but even if it wasn't the teacher's four generations of Huo Yingbo Feng Shui, Saringen would probably continue to be taken back. Therefore, Hatake Kakashi's application of sharingan can be said to have been explored by his own scientific research, and even his own sharingan kaleidoscope sharingan was realized after a long time.
Although Uchiha Obito probably didn't get the work experience of Neiguangzong aiming at Shalingen, he was taught by the former Neiguangzong strong man, Napo Madara.
As a former strong man and leader of the Uchibo clan, Madara's mastery of sharingan can't be compared with those of the Uchibo clan. With Uchihiro Shoko Asahara's teaching, Uchiha Obito is bound to be much stronger than many later generations, not to mention compared with Kakashi. That's my answer. I hope it helps you. If you have any comments, please leave a message in the comment area for discussion.