Is there a reason why gog forums don't have the "Find all/recent posts by User" option?
Sadly, the best answer we get is that it's too much work and GOG can't afford to hire someone to do it. It's what they say pretty much whenever the forum userbase collectively asks for something. To be fair, though, they do also sometimes say that they'll be rolling out the requested feature with Galaxy. Which, increasingly, seems to be more or less the same reply :/
Rarely, we do get the "it's not a bug, it's a feature" response. I'm too lazy right now to google it (which is what you should be doing to find things on the GOG forums, most of the time, anyway, truth be told) to be sure in which category this one falls.