I thought that was just part of the stylization of the design. To show some new transformations are special to us, they'll add the extra detail of the pupil, but in universe, no one ever commented on how a super saiyan's pupil disappears. And of course without a pupil, what do they see out of.
So I'm not sure why anyone in story would consider Vegeta's new thing a new form. It's a new level of power, but it's not a new form. I refuse to accept that slightly darker hair and a slightly different aura counts as a new form now.
Don't mistake me, I'm glad he got the power up, and am perfectly fine considering it a new level. But new form? Come on.
Do the pupils actually disappear and reappear?
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