I get that they are chakra chains blue but I stil find the way its being used right now to be ridiculous.
Chakra controls the bijuu: we see Kushina use them to keep the kyuubi at bay (both in naruto and in her flashback) because the kyuubi was sealed with her chakra, so yea that bond forms "chains" to subdue it.
We saw Obito install the sharingan and rinnegan in the Jinchus to control them via Gedo rods because those rods transmit chakra, the bijuu act up and he uses his chakra to subdue them ala chains. To me, at this point, the chains were more of the physical output as a result of subduing a "beast". It was poetic, and it made sense. Now out of the blue all along kishi means to tell me that the Uzamaki's can LITERALLY made their chakra tangible in that way? Whats done is done but meh, didn't like how it was revealed. Seems like soemthing just tacked on for convenience sake.