brouer: I hide to exclude them from being backed up by gogrepo.
I started around when my total library grew to 500-600 games and I thought it was ridiculous to store stuff I didn't care about keeping safe. Same reason I don't download Mac versions.
Fair enough I guess, by the sound of the level of automation you use.
I'd probably just use tags, and skip based on that, but then I'm not doing that kind of automation with gogcli.exe.
I automate a lot, but mix in some manual aspects, to have closer control. In fact I've done some huge changes to how Updates are dealt with, by my GUI. Me, the perennial record keeper of lists. LOL
It is much easier for me now to deal with game updates, easier to keep on top of them, whereas before they had grown to a huge number (some hundreds), before I got around to addressing them.
To be fair to me, GOG are mostly to blame due to lousy download speeds. I've now dealt with that to a reasonable degree, and so have been able to deal with all my pending game updates ... though somewhat annoyingly, some games seem to get constant updates, especially some demos ... not sure why they go to all that trouble, for something that is purely an example or should just be.