Earlier quoted context omitted.
So, for CSS and such nothing like Bootstrap, or Foundation, etc.?
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?