I really wish GitHub would have some sort of flag for "stale" projects. I use your methods too (issues, dates, etc.), and I'm usually disappointed when search results bring up ghost projects. However, in a few instances, I found a project that was similar to an issue I was working on that went one step beyond where I was, and even though it was a ghost project, it helped. But in general, these projects don't help. I'm also disappointed that I'm thinking, "Hmmm, maybe LLMs can help..."