Apple sold more than 500 million iPads over the product's first decade.
If all iPads disappeared off the face of the earth tomorrow, it wouldn't be nearly as big of a deal compared to if that happened with smartphones or laptops or PCs, etc.
Meta has a big hurdle to overcome to make success out of a device with no real practical use so far, and one that you have to strap to your face.
Many people have replaced their laptops and computers with an iPad because they only check email/Facebook/watch youtube/surf the web.