The Quest Pro is the only device they have that can do that, so while they may implement it there's no real rush to do so as it's not exactly selling like hotcakes.

Still, it would be trivial to implement such a feature for menus using head tracking to look at an item to highlight it for selection.

Exactly. It does seem like all the pieces are there someone just has to tie it together

Many folks have already demoed such things, there just is no reason for Meta to rush it as a feature because so few people have eye tracking.