Yeah, it's a novelty. Especially considering it only appears to have 8GB NAND total with 2GB taken up by the OS. For the price, although with a smaller screen (and is much more travel friendly), might as well buy an Ayn Neo or Retroid Pocket 4. Both would have substantially more CPU power, storage and ram.
You could, in theory, play with two screens. However the controls are hardwired onto the device and IIRC it doesn't have Bluetooth .
Having two screens for stuff would be better handled on the renderer's side with OBS and screen overlays. Unless you are talking about two seperate streams at the same time? (eg: one from your PC at home and another from your Xbox)