I appreciate your points. Can you share more about how you interacted with other teams? Did you have resources to help implement the components into products? Did you use any tools or meeting formats to gather feedback and listen to needs?
Regarding tools, I recall a bunch of stuff. YMMV:
* A presentation to the wider team on the goals of the library.
* GitHub issues outlining technical design of the library -- this was useful for getting buy-in from tech leads.
* One of the consuming developers gave a presentation on how she had implemented a UI using EUI.
I think it just comes down to repetition and, as snide alluded, positioning yourself as a servant instead of an authority. Keep beating the drum, share success stories, and demonstrate that you're responsive to the feedback you're heading from the folks downstream. Good luck!
Start with version 60 to make it look like it's a very mature product ;)