Not for the core. I'm trying to fight for performance even on CSS side
But it's optional — you could to write your own widgets, with libraries of your choice.
The 'Better UX for Enterprise' example you have makes it look more like an admin UI (sort of like django-admin) than an end-user UX. Is that a fair description?
Do you have some service in mind, so frontendus could help?
I do, but won't be ready to move on it for several months at least (meanwhile I am collecting the data in order to put an API on it). I also have plenty of front-end skills myself, but the Q is how much do I have time to do.