I've had this argument all day yesterday (on Discord, of course) about whether Steam can ever be dethroned, and your last sentence nails it on the head: while Steam has tried for a while to integrate social features into their store (and made a real mess of it), Discord is THE place where engaged gamers go to find a community. I buy on Steam because I like the centralised hub for installing and uninstalling, but the discovery process is just horrible: most of the games that go on my wishlist come from suggestions from other players in the Discord servers I'm active in. I only spend on Steam the bare minimum time I need to manage my library. I imagine that for a developer it must be a pretty good prospect, having the product for sale just a click away from where the discussion is; for me as a consumer the critical part will be how well the store works on mobile: I do 90% of my Discord activity on an iPhone, and if it's as frictionless as buying on Steam but with a better mobile experience, I will definitely give it a go.