Tablets were always the odd device out of the bag.
Too big to put in your pocket, and not nearly as productive as a laptop with a keyboard. They were fine as a toy or purely entertainment device for someone in the backseat of a car, but mostly a dead-end as far as tech advancements go.
Because only they understand that the killer feature of tablet is being the new laptops, and not just bigger phones.
Also for hobby development on the go, iOS or Windows stack are more fun to use than the whole Studio + J++ + NDK maintained as 20% project.