Bookmarks have received woefully little attention in all browsers for reasons unknown to me. If one pulls up a browser from 20 years ago, bookmark management is basically identical or even slightly better in some circumstances.
I guess making bookmarks better isn’t sexy so nobody’s bothered.
Over the years, there have been dozens of serious attempts at reinventing bookmarks (from third-party services and plugins), and none of them have caught on.
My conclusion is that they're just not a concept that works for people; they got squeezed out by web search on one side and complex note-taking applications on the other.
I think there’s room for better bookmarks, but they have to be a part of the browser proper… third party apps and even browser extensions can never be integrated to the required extent, but none of the big browser makers have iterated in this space at all.
I guess making bookmarks better isn’t sexy so nobody’s bothered.