As surely you know, the Steam Deck was delayed until the beginning of the next year, so those who sought to put their hands over this console should wait a little more. Meanwhile, Valve has released new information that will surely interest you if, for some strange reason, you thought about acquiring the Steam Deck by the subject of exclusivity.
As part of a FAQ Published in the event of Steamworks Steam Deck, Valve C Confirmed that they are not interested in publishing exclusive games for Steam Deck:
No, the exclusive ones do not make sense for us. It is a PC and should run the same games as a PC.
However, this portable device will be able to access third-party applications that can normally be installed on a desktop computer. Essentially, this means that you can run alien games of Steam, thus becoming the Steam Deck on a handheld computer, basically.
Editor's note: Sincerely, I think nobody expected Steam Deck to be exclusive. I mean, it is not really a portable console as such, but a mini computer capable of reproducing a wide selection of games within the Steam catalog. But who knows, maybe Valve surprises us in the future with this exclusivity.