It is ashamed but that's was not only Masashi but Yahagi's fault as well. Here's something I want to explain. We, the audience, knew that Minato/4th Hokage was Naruto's father and the one who sealed Kurama inside him. But the issue was that to get to that reveal, heavy teasing was applied way back in Part 1. Same thing that happened with Kushina. Heavily teased too but she finally appeared to her son. Ok, then, what about the Uzumaki clan as a whole? All we got about them was the longevity, sealing techniques, very close to the Senju Clan and that those damn masks! Besides Naruto, we had Nagato with the Rinnegan abilities (and some BS like a chakra cannon), Karin and Kushina with the chakra chains, Mito who was originally Kurama's jailer, and you might as well add Tsunade because she is a relative, confirmed that Hashirama and Mito were her grandparents. And I did recalled that the Uzumaki clan were very deadly, which resulted a war that led to their "extinction" and possibility that we might have more survivors out there, besides Naruto, Karin and Tsunade.
All we received: Sasuke and, what I said this many times, "All my Uchihas!" What I'm saying is, stop with the heavy teasing, just reveal goddamnit! All for what, shock factor?! Killing off a character is a better usage for that (but then again, we lost Neji!) The Uzumaki clan, that was tied to Naruto, would've brought more stuff for him to the table however Sasuke, once again, instead took the opportunity. All wasted, its no wonder why this franchise had been joked around in memes because Sasuke was dominating the plot for the rest of Part 1 and majority of Part 2.
I stated this many times, Masashi and Yahagi should had proposed and created a spin-off dedicated to Sasuke at the time because that way it would not only make money as Sasuke was one of the most popular characters, but it would brought in balance for the franchise. Give more room of growth for Naruto and also Sakura, Kakashi and the rest of the side characters, including Hinata, in the main manga while all of the other info regarding the Uchihas would've been in Sasuke's spin-off. I don't understand why he hadn't thought of that since he did mentioned earlier in his interviews he was into the money. Didn't even capitalize the idea... yet, Rock Lee managed to get it!
Yeah, and Naruto SD: Rock Lee and his Nina Pals is more of a comedy with all the nonsense in it not being canon! But if Sasuke had his own spin-off, it could have been done in canon, showing his time with Orochimaru, his thoughts, his growth, so much more. That's why I want my fanfic to make the most o trying to show Sasuke go through a lot in his struggle to gain his own sense of redemption for his actions, and to figure out what he truly is wanting rather than just to be driven by hatred, bitterness and jealousy.