Multiverse General Do Naruto fans think this is impressive?

Doesn't matter, Blackbeard used a specific technique to make his arm much more durable, Obito didn't.
How do you know he didn't use chakra? And Tobi's right arm is special lmao, Madara enhanced it with white zetsu/Hashirama dna. Though anime shows left arm, its right arm in the manga.
It wasn’t supposed to be that impressive, it was just there to hint at Tobi’s true strength since he hadn’t done shit