I think AR/MR are good candidates for investment for Apple right now. They just launched sales of their Vision Pro today, shipping in two weeks. They are launching an entire new category of product which necessarily requires a broad spectrum of deep engineering investment. The current product is clearly too bulky and expensive for mainstream appeal, so they are going to need to release repeated generational improvements to both cost and size. The ten years from AR glasses is ten years of heavy product investment.

And as others said, there is a lot happening in AI too which would go well with headsets and phones alike.