DRM-Free is the most valuable feature of a game. Worth it to pay full price, even. There were some other tenets and values that gog offered, as "core features", before... Cough! Just like their advertising videos in Youtube, still preserved, unveil... Cough! But something bad happened to them and other got abolished, other got altered.
At one point, there was overflow of people nagging and demanding achievements, client, profiles, or else they wouldn't find it interesting doing business with gog. Hence, the slow transformation to steam-like service. Keep in mind, though, that all those news and extras, are "optional", at least up to now. You don't have to go through them, if you don't want to.
So, unless DRM-Free feature itself gets abolished, GOG is going to always be different. But sigh, the absence of oldies is very noticeable, alas.