Proper links and mapping of navigation to browser history are also important for any content-focused webapp. Keyboard navigation is incomplete too (some elements like dropdowns).
I hear you. There's a link widget coming, multiple browser history models (we've only supported URL fragments, but are adding pushState, and custom URL strategies, as well as navigation API improvements). Keyboard navigation is being actively improved. Bug reports are always welcome: https://github.com/flutter/flutter/issues/new/choose