Do we also point out being the first to implement DRM and erode digital ownership, being the first to tie game installation to a platform client, creating micro transactions or being fine with child gambling (CS skins) in the net negatives, or are we not allowed to criticize Lord Gabel today?

The gambling is the only thing I think you can reasonably attack them for. They didn't create microtransactions, those had already been figured out in Korea. The DRM was necessary for Steam to be palatable to publishers (and it's always been more of a pro-forma thing than a real attempt at DRM like Denuvo), and a world without Steam would absolutely have seen per-publisher e-shops that would also have DRM. Tying game installation to a game client... again, that was a 'when' not an 'if', and they weren't even the first. If I recall, you had to install a client to install Wild Tangent games. The client was also, arguably, malware.