Considering in china she can be skillbroken since 3 stars onwards and considering we do not have the edo jinchuriki treasure with her as one of the two common rares in, that's indeed the real reason.

The problem is, who goes for her when edo roshi and naruto six paths do the same work better?

P.S. You obviously didn't look at the picture. He owns her and he also owns her at around 70/80 fragments (that i may say was quite the luck considering he owns itachi susano'o but not also sasuke susano'o, so he rolled less than 2000 times in kage treasure. I suppose he fully went for the other treasures with his fragments in).

@OP: the reason is that on china she is a common rare in one of the earliest jinchuriki edo tensei treasures, so if you use 300 scrolls in it you get her 2/3 times easily.

The problem is that as i said here she is not skillbreakable at 3 stars and that treasure is not available, so they actually made her a whale only toy while makes no sense she is, since literally no whale would use her since naruto six paths and edo roshi do her same job but better.

@Jiburiru/Exvious: tell to the management that is pointless to be this greedy even on those things. It was extremely mean to show her not breakable at 3 stars. There are people that gained before ay4th or sasuke susano'o than her, that you also do not make her fragments redeemable is twice as much mean.