On a 16 hour flight you can watch the onscreen entertainment, use your wireless laptop, your wireless tablet and your wireless phone. I’ve travelled a bit and usually alternate among them.

But the Vision Pro would need two cables (power brick and battery pack, which is required even when plugged in to the brick) and when you get up to use the bathroom your neighbor will absolutely trip crossing your seat and land their ass on the Vision Pro you left behind.. that you don’t want to wear into the cramped airplane bathroom.

The Steam deck or Nintendo switch are even better than either. You can get good headphones and play real games for 16 hours. And when you need to move they are easy to stow away

Indeed: better to let them think you're viewing pornography, than to remove all doubt.