For fun, I've been working on what you would call AdminThemeBootstrap to get a deeper understanding of ProcessWire's admin framework (maybe I'll release it one day but it's more of a pet project).  As you may know, the current admin system has a deep dependency on jQuery and jQuery UI (which is now deprecated in maintenance mode).  Things like the navbar dropdowns, tabs and accordions are jQuery UI based components, not (for example) UIkit's dropdown or Bootstrap's dropdown.
 
	This has gotten me thinking about if there was (not that it's necessary) a comprehensive re-thinking of the admin, what libraries in today's world would be the ideal fit for a project like ProcessWire?