tomimt: But with Steam, you need to jump through hoops, with Galaxy it's a feature. It isn't really the same thing, as with GOG it's customer service and with Steam something hidden in the basement.
And in what way does this feature rely on an online client?
This can be done on the site with normal downloads just as well.
but wait.. let me quote GOG themselve:
Always optional
Beyond all these features, GOG Galaxy will never be mandatory. And that’s great motivation for us - we want to make it so good, that you actually want to use it.
Break what already worked on the site.. don't impement new features in the site.. do everything with Galaxy even if it in no way requires an online client.
GOG Galaxy. The optional client..
Just as a reminder.. steam started as a comfortable client for keeping mods up to date...
http://www.pcgamer.com/steam-versions/