What do you mean they abandon hardware quickly? They still support the Link, Controller, and Index. The Link hardware still gets software updates, and the idea

What do you mean they abandon hardware quickly? They still support the Link, Controller, and Index. The Link hardware still gets software updates, and the idea lives on through the Link application. Same with the Controller: it's discontinued, but the steam input framework it uses still gets updates, and now can be used by all modern controllers. You could argue they quickly abandoned Steam Machines, but they didn't actually make any, they were just branded PCs (so they didn't need active support from Valve), and barely any sold. They still support the SteamOS some ran on, because the Steam Deck also runs SteamOS.