It wouldn’t surprise me if Apple has been working on this for more than 9 years. They know not to release until all parts are mature enough to make a successful

It wouldn’t surprise me if Apple has been working on this for more than 9 years. They know not to release until all parts are mature enough to make a successful release. Sometime the hardware just isn’t there yet, and you have to wait a few generation for it to be smaller/faster/have more pixels/use less energy. And even today it seems that hardware is not at a level where they can do a successful consumer release, so they have a pro version for markets that can work around the limitations of todays hardware, like the huge size of the goggles or the BOM cost.