User blog comment:Angel Emfrbl/A theory on Luka V4x/@comment-28951715-20160710045734

HM. An interesting theory. I'm all about this kind of stuff- also your conclusion xDDD I do think you're right about Luka being tossed out as an "experiment" of sorts. I also agree that she was rushed. They could have done a whole lot more with her voicebanks, and it's a crying shame that she ended up the way she did. The quality was an improvement, sure, but compared to the improvements of the Kagamine's or Miku's upcoming V4X (hearing comparisons, it's clear what the differences are, and how it's made a positive impact), it's minute.

Though tbh it might not even be the fan's didn't see Sonika quality v. Luka quality- they probably didn't ask about Luka since she was already a megastar, and with Sonika it might've just been the hype and the desire to see a better vocal.

But hey, that's just a theory! :D