Smart glasses are about a 15 million unit per year business. Smart watches are about 150 million units per year. Meta owns about half the smart glasses business, but it hasn't provided them a platform they can control that has enough penetration to make a difference.

But wait it gets worse: since Meta hasn't got a platform comparable to a mainstream PC or mobile device OS, the Meta glasses business is vulnerable and subscale, as impressive as owning half the TAM is. Since Meta glasses aren't a companion to an existing platform (not even AndroidAR, even though they run Android) they will become a second tier choice as soon as Apple or Samsung ship a smart glasses product.