I've tried dozens of services through the years and have always come away disappointed. I literally just want to store a URL and the page title — just text will do. I don't want an overwhelming visual list of my bookmarks. I don't want the page content scraped and stored. I don't need to share my bookmarks (other than syncing across devices). I would like some easy way to flag and clean up old 404-ing bookmarks. Simple categorisation or tagging. And a simple one-click add-to-inbox plugin that'd work on all my browsers including on iOS. And I'd like a good-looking UI — not an ugly mess like Pinboard. And of course there should be a solid export interface so that users aren't locked into some proprietary data structure.
As a product designer I'd love to sink my teeth into this problem but unfortunately it's a dev-heavy project and that's outside my comfort-zone.
For now I'm sticking with my fallback solution — dozens of 'link dump' notes in the Mac Notes app. It's searchable, lightweight, and flexible but a nightmare to manage. There must be something better out there.