The UI to browse these mods is something out of a geocities website from the 1990s.
I should've been more specific, I meant modding that enables creators to actually make money and gets promoted by the game developer - not a dark corner that hasn't been updated in 30 years where you can click an image but can't get to the next image without zooming out. That's not modding, that's, I don't even know what to call it - a historical artifact by people who don't seem to be aware of what century we're in.
Is the Steam Workshop that bad for Civ?
The much more problematic DRM and other walled garden issues aside, Steam's interface seems to be designed to emphasize safety, which would be fitting for software aimed at pre-teens, but is actually harmful for the teenagers and older that are its target.
(Of course one reason Valve likely did it is because it makes the job of their moderators easier - compare with the old Steam phpBB forums - and company-paid moderators is also the easiest moderation system to set up and maybe more importantly, remain in control of.)