Yup, its extremely obvious too when every existing developer / distributor proclaims that they will no longer be developing Vocaloids from here on out. If Sora had started production a couple years later, we would probably see her on either SynthV right now like the Kotonohas, or even CevioAI. Internet co's relationship with them too isn't looking good, and Crypton is well past moved on. Yamaha probably thinks that the old method of producing and distributing is no longer financially viable, which other voicebank devs probably disagree on, seeing as voicebank production has moved on without V5.I think my only real issue with Yamaha (not exclusive to V5) right now is how uh... draconian they are with Vocaloid.
What I think is interesting here too, is that Sora V5 also comes with an additional downloadable custom Attack / Release pack, I have no idea what that entails, but I can imagine it at least includes original vocal fry and end breath recordings. Even though Sora wasn't intended for V5, at least they fitted her with V5's newest feature. I'm planning on getting her V5 this next year, probably once AHS drops another SynthV bank so I can save on combined box shipping, so I'll see then. I don't have a single V5 besides the 4 starter voices I temporarily installed once, so I'm looking forward to seeing if a native v5 vb can have actual good vocal fry options. I find the vocal fry attack options sound really bad for the vast majority of pre existing vocaloids, which sucks because its a pretty cool feature.Sora was really obviously meant to be V4 (she was teased almost an entire year before V5 was announced), but AHS wasn't allowed to release her until V5 was out. Sure, you can mess with V5's parameters to smooth out transitions between banks, but it's pretty obvious that AHS didn't really have that in mind - otherwise Sora wouldn't have two banks. Any V3-V4 Vocaloid can utilize V5's parameters too - with V5's high price point and Sora's also high price point because of her two banks (you could just buy one though), it makes her... kinda inaccessible, and that's just a bit sad to me. People might say she's just unpopular, but I honestly think she got a bit screwed over.
(Also Gynoid bragged about the Meikas being "the first third party Vocaloids developed specifically for V5," so. that's a confirmation in itself that Sora wasn't intended for V5)