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The search functionality, perhaps?
I don't necessarily have solid suggestions for how to improve it, but I seldom manage to find stuff I know I've seen on SN before. As the site grows, this may become even more important.
Suggestions:
  • Search within search results.
  • Quoted text treated as single search term, e.g., "lightning wallet" should return only results for "lightning wallet", not "lightning" OR "wallet".