Had anybody addressed how adding in things like "libraries" and such introduce issues, including security issues, to that faction that already doesn't update in the first place?

We're still trying to get people to keep their themes and plugins and core up to date in an effective manner. Adding in third party libraries seems like a long-term recipe for a security disaster.

Witness the large number of themes using outdated third-party sliders. How do you solve that problem, exactly? What is your solution to DLL-HELL?