Indeed, it's an odd move, because they've gone all in on mixed reality which must have pushed the cost up considerably, but left out the one piece of hardware that was actually essential for their "metaverse" vision to really succeed. That means it'll be years now before there's even a viable piece of hardware for it.
It honestly feels like Zuckerberg is chasing Apple here (which is a weird thing to say when Apple hasn't even released anything). He doesn't want to lose the race to true AR. But at the same time they have absolutely failed to release anything at all compelling in the mixed reality space for the Quest Pro. It all feels very unfocused / uncoordinated.
I think they would have been far better off dropping mixed reality, putting basic eye tracking in and selling it at $399.