They're halfway to what you want but can't go further because everyone has slightly different needs and browsers are already complex enough without baking in prebuilt components for everything from data tables to carousels to modals to drop-down menus.
Also, the list of things that bug you that a language needs describes pretty much every programming language in existence.
The bit about ecosystem and the context on JavaScript makes me certain he meant external needs - in other words he'd like "batteries to be included". There are several languages that come with a lot of stuff out of the box.