What it misses for me personally is an ability to search over the pages my links are pointing to. Ideally within some additional radius over the links these pages have. Perhaps, it won't be easy to implement, but it looks like the only way to find a page you've bookmarked a year ago when you vaguely remember what was it about... Even integration with Google Custom Search would do the job here.
To clarify, the suggestion here is to search the contents of a given Link, not just the link's title or url? For example, if I have a webpage "www.linkidex.com/test" which displays a bunch of text, including "HackerNews2022", you need the ability to find this link by searching for `HackerNews2022`, assuming that you haven't named the link `HackerNews2022` or tagged it or categorized it as such? Some of our competitor…
It's ok if bookmarked pages change. It's no different from a normal search engine, you just reduce the scope of a search from the whole internet to some private curated collection. Google CSE is good for that, one just need to write an interface to update it with bookmarked links...