I agree with your general point, but I don't think it's applicable here really. Raindrop targets users who aren't looking for "a relatively simple and clear-cut... bookmark stash". That's part of what it offers, but the actual value over a myriad of other tools is in the broader feature set, like web page highlights, uploading files and treating them as bookmarks, automatic bookmarking from other web services (e.g., auto bookmarking Twitter favorites), etc. There's still a ways to go for the service without departing from the core vision. For example, one of the more popular user requests seems to be for bookmarked PDFs to have the same highlighting options as bookmarked web pages.