by that logic kcm naruto would be allowed since he used it for taijutsu frequently:sy:
Mokuton is not used in conjunction with taijutsu what manga are you reading?
Susanoo & BM are still chakra based attacks, they arent attacking with fists & kicks
Obito uses taijutsu when he fights with kamui, just like the raikage fights with taijutsu using raiton armor...
The examples you posted are of people using ninjutsu (chakra based attacks). Since kamui is only defensive, obito has no choice but to use taijutsu. Unless he warps himself/somebody, then its ninjutsu.