It's a bit of an chicken-and-egg problem - or as we like to say, an equilibrium of many.
Every attempt I did to use any great tagging system, in pretty much anything ever, had resulted in the system/app/infrastructure (etc.) dying sooner or later, which is why I don't use any of that stuff, creating the same externality for others.
Folders, on the other hand, are stable. You can't change folders, at least not simply.
Jumping between those equilbrias needs a better strategy than "offer tags".
Every attempt I did to use any great tagging system, in pretty much anything ever, had resulted in the system/app/infrastructure (etc.) dying sooner or later, which is why I don't use any of that stuff, creating the same externality for others.
Folders, on the other hand, are stable. You can't change folders, at least not simply.
Jumping between those equilbrias needs a better strategy than "offer tags".