When I look around in the economy class (HKG-CDG), many people are sitting here with iPads Pro or MacBooks. The financial difference to the VisionPro is not that huge.
But in class, wearing those there would be (afaik), no clear indicator of you paying attention to the teaching, that would be more akin to wearing airpod max to the class.
I think you misunderstood OP's comment, they were talking about _economy class_ in airplanes, not school classes.