Sounds to me like a search engine problem not something a new aggregating instance can help with.
Not sure I understand the issue with the URLs, but any decent search engine will give you more important information about the web page than the URL, so again, it seems to be a search engine problem.
Sounds to me you just lemmy to be mainstream and huge straight away. I personally have little expectation that searching for general information in a search engine is going to bring up lemmy pages. We are a fair way out from that, and an aggregator instance won’t change that.
What will help, in the mean time, is multi-communities that are easily shareable. Also sorting algos that surface smaller communities. Once that lands, and people start defining them for certain needs, I think the community ecosystem will get some stability and clarity and focus.