Huh. It should have occurred to me that
"slide-up gamepads" was a patented form factor.
https://retrododo.com/sonys-patent-on-sliding-handhelds-has-ended-paving-the-way-for-a-retro-revival/
"Have you ever wondered why we never saw more sliding handheld technology after the Sony Xperia Play? If you weren't in the handheld or mobile business, then you probably didn't know that Sony filed a patent for the gaming handheld with a slide-up screen back in 2010, a year before the Xperia Play released. "
#retrogaming