The only real benefit to a docked Steam Deck is a bigger screen

The handheld Valve Steam Deck may be getting a specialized dock for playing on a TV screen or monitor, but you shouldn’t expect it to be able to do any more than that. 

That’s according to Valve designer Greg Coomer (via PC Gamer), who confirmed that the Steam Deck won’t get a performance boost in its docked mode. The company considered it, but ultimately decided not to go down that route. 
…
Read more