Kamui is not a kill tech. The manga shows it can rip things apart when kamui "fail". Successful kamui never rip anything apart. And through manga, we see kamui usage is to teleport something to a 5 star hotel to go on a vacation. How is that 1 hit ko jutsu? Manga never kamui to kill, while fans insist kamui is aim to kill. It's not only overrated, its interpretation is not even accurate. When a person got kamui snipped, he had all his life to transport himself back to other dimension(not all characters can do that, but MANY can get out). As long as "every jutsu has its weakness" stands, there's always a way out after got kamui snipped to la la land