I wasn't just referring to DN3D in particular. Besides, not every GOG user uses Steam
I think most GoG users who don't use Steam wouldn't be likely to install any other 3rd party distribution software...
He's not talking about distribution software. He's talking about an optional chat client / game launcher. I, for one, would welcome such a program, provided it was, as mentioned, optional. Knowing GOG, I'm sure it would be, as is their downloader. They also wouldn't make it as a service, running in the background all the time, hogging resources. They'd just make a handy application that you could use, if you wanted, when you needed those specific features. That is, completely unlike Steam.