I didn't come into this argument to backseat engineer but point out that the idea that Valve is removing functionality to discourage using other DRM services goes against their history and business sense.Is it a case of Valve purposely restricting the config tool, or a case of not yet implementing support for manually loaded configurations?
For your cases:
- DRM in a product on Steam means Valve gets a cut.
- DRM on SteamOS is something Valve can't legally control as far as I know -- it's Linux.
- Broadcasting and streaming "just work" from the overlay, not much additional development cost as far as I know. See below about configurations.
How would community configurations for non-Steam games work? Someone just mentioned that addding a non-Steam shortcut means a new game ID gets created, and that's presumably unique for any given user. That means to share configurations, Valve would have to create a completely non-Steam-specific hosting service for people to browse and download configurations for competing games. That seems like work and cost to me for little benefit, so at least it's understandable if it's a low priority for Valve.
They could of course allow manual configurations that people save locally. That would be nice to have if it doesn't exist already.
If they find out a solution they'll use it.