TL;DR: this exists so you can make your early robotics prototype tooling easily field-portable

Finally, you've prototyped your robot, sensor platform, or other outdoor-project. And it's time to go outside to test

You have all the tooling on your laptop - to connect a controller, a radio, and maybe some other peripherals to interact/debug/fly it.

Now you must decide to either:

• Drag a laptop outside with you for something that is otherwise a mundane I/O application
• Cross-compile everything for Android, fight with the permissions system, JNI, NDK, download Android Studio, and all the other foot guns

If only you had a portable platform for quickly running basic scripts + simple UI's, that was easy to obtain, field-ready, and had tactile buttons for when a keyboard or touchscreen isn't what you're.

The rg552 is an ARM-based game console for playing retro games. But retro games are the least interesting use case. It's got:

• several tactile buttons, 
• two joysticks
• a touchscreen
• HDMI out
• 4 gigs of RAM
• USB host capability on one port (yes, on nixos it supports hubs)
• 64gb eMMC and two SD card slots

This is the perfect hand-controller for low-stakes hobby robotics and other in-field hobbies that need a head unit to run basic tasks.

And this whole thing costs just 150-200 dollars depending on the vendor. I aint buying a raspberry pi for that price. frankly im surprised they can make any money at that price point