The repeated insistence that a company can only possibly be successful if it reaches every human being on earth is killing the world.
A company that spins up a division, builds a product, sells 100k of them, and winds down is a success
Keep in mind this entire venture from Valve is also about ensuring they can't be made a vassal of Microsoft.
Valve isn't doesn't have to appease any public shareholders every quarter. There are likely no real expectations apart from making some profit which I am sure they will easily do. Then they just do like they have done with the Steamdeck and leave it on their store as an item they keep in stock and make some decent side income on. Throw it on sale for all their big sales and get some nice sales bonuses off it here and there.
I think ultimately there goal is to push more people towards Linux so that more games get developed there. All of their hardware pretty much targets the Linux side of gaming, so they really are trying to get rid of the Microsoft monopoly on PC gaming which I think is great.