The deck already has bluetooth for controllers and HDMI out if you get a standard USB3/HDMI dongle (or their expensive dock).
Essentially all you're asking for them to add is better specs.
In December their revised branding guidelines added a "Powered by SteamOS" badge so presumably 3rd-party boxes with various specs in set-top form factors will be coming before too long:
> The Powered by SteamOS logo indicates that a hardware device will run the
SteamOS and boot into SteamOS upon powering on the device. Partners /
manufacturers will ship hardware with a Steam image in the form provided by and/or developed in close collaboration with Valve.
Better specs would also be interesting, because Steam's current "Steam Deck Verified" does check if games run well on the Steam Deck's hardware. There's another check for text size on the smaller 7" screen too.
Essentially all you're asking for them to add is better specs.
In December their revised branding guidelines added a "Powered by SteamOS" badge so presumably 3rd-party boxes with various specs in set-top form factors will be coming before too long:
> The Powered by SteamOS logo indicates that a hardware device will run the SteamOS and boot into SteamOS upon powering on the device. Partners / manufacturers will ship hardware with a Steam image in the form provided by and/or developed in close collaboration with Valve.