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.
I have a Rii mini keyboard as a remote control for YouTube, when I sit back. Typing anything on such a keyboard is a struggle and usually don’t type on it. The integrated keyboard from the handheld in the picture doesn’t look particularly good either. But I have to say, with such a small screen and especially with Windows not optimized for this task, such a keyboard is probably better than having none.
Alternative would be using a virtual keyboard on a small screen, which overlaps parts of it and does not have the greatest touch input screen. Look how small the screen is. Such a small 6" screen is only an option for smartphones, but not for an operating system like Windows with a regular desktop to play games on it. Therefore, such an integrated keyboard is probably a good idea. Even if it sucks.