My guess: the Quest 2 drop is because PSVR just came out and they want to be a clear winner on price, and the Quest Pro drop is because they've seen soft demand.
I don't know anyone who has a Pro, I know quite a few who got a 2 at the original price, and I'd probably have bought a 2 by now if it hadn't gone up in price.
While I have not seen any Must Have use case for VR (nor does the technology currently seem fit for purpose) - I do appreciate the rationale for trying to trail-blaze this space. Facebook is subject to the whims of iOS and Android policy. They need/want to own a platform they control.
John Carmack was very vocal about that when he was still involved with Meta.
I’d bet Meta’s best chance of winning here would be to build a great software and games ecosystem and sell the devices at a loss, just like game consoles.
I'm referring to short-to-medium term margin on the devices themselves.