IronArcturus: So long as the client is not mandatory then GOG can still be considered DRM-free. But many people in the forums are worried that GOG Galaxy could become de facto mandatory over time. This could start with GOG no longer updating games through separate patches on the website, but through the client only. If downloading the game and patches cannot be done through the website anymore, I would argue that GOG could no longer call itself DRM-free. Here's hoping that GOG Galaxy will always be optional.
But that's not DRM. If you are familiar with Linux, most software is installed using a "dedicated client" we call a package manager. Downloading and installing software manually is rare, and if a package has to be installed and updated manually, it's considered a pain in the ass. Yet all the software installed with the dedicated client (apt-get, rpm, yum, etc.) is all free (as in freedom) software and very much DRM free. And if you really want to, you can manually download a package and invoke the package manager manually to install something.
A dedicated client is not DRM - it's considered a convenience in most of the modern and free software world. As long as it's not the only way to get software, your not losing anything, just gaining convenience.
Plus, I haven't heard ANYTHING to suggest that Galaxy would become mandatory, so I don't know where the worry is coming from. More likely, it might become so convenient that nobody sane would NOT use it because manually managing your ever-growing GOG library will be viewed as an exercise in masochism. I kind of already feel that way since my library has grown a lot in the last few years.
Here's the solution: rather than fearing Galaxy, make sure you advocate that it is either open-source so you can modify and improve it yourself so GOG can't control you, or lobby for an API that will support any number of clients, not just Galaxy..