I don't think you should expect SynthV level of realism from vocaloid, it's pretty obvious that it's not even about "ability" at this point, they likely could if they wanted to, but it's definitely not their aim, they likely on purpose keep the artificial feel. actually, the UI of V7 makes it even more obvious they're straying more from the "faceless" voicebank philosophy to go all in into the character aspect as V7 features the characters way more prominently on the editor, whether it's the face on the tracks, the background picture on the piano roll...