A bit surprising that these seem so far away from production. I think Apple is playing it properly here: Announce a product people really want, even if its very far into the future and may possibly not actually come onto the market for years. Use the feedback from the public to fine tune the product as it's developed.
Facebook seems now to be something like the company whose former HQ it inhabits: Xerox PARC. Potentially vital R/D happening in such a way as to have almost zero chance of actually becoming a product.
I can't be excited for Butterscotch or Flamera, because they're not products I can buy, and they explicitly never will be. If I managed to get a demo, I'm sure I'd be NDAed to hell and back. I am excited for Vision Pro because it's something I will actually be allowed to purchase in the future.