TL;DR: Antec is going to be selling a Steam Deck competitive device, based on the Ayaneo Slide. The device has a slide up screen that reveals a keyboard, which is good because using desktop windows is much easier with a keyboard. However the device’s lowest estimated power draw at low/no load is 15w, meaning it will use comparable power to the deck running at max power. This means the battery life will probably be pretty rough when compared to the Deck. It will also likely have a much higher price point.
Increased battery drain for diminishing returns. From the distance and screen size, it wouldn’t be that noticeable, but the performance drops would be.
As someone with a 4k OLED phone and a Steam Deck OLED, the difference pretty well screams at me. I don’t mind it so much though. It’s still pretty damn nice!