I can envision use cases like wanting to be able to search through all your documents or photos when you can't clearly remember what you wrote (assuming it's properly implemented and well-secured, e.g. path-constrained time-limited read-only access), or local chatbot for brainstorming, or if you want to play around with agentic "AI" (automating small things on the local system that aren't easily scripted) then having one that is private and properly sandboxed would be helpful.