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Let the user help solve their own problem
I wish we had a maps app like Apple Maps or Google Maps that let you order up a travel itinerary using public transit between two points, and explicitly pick the transit routes involved. Or, ideally, multiple sets of routes, for comparison.
For the transit routing example, it’s a more complex problem (not a simple ham-or-spam dichotomy) and there are privacy considerations. The user who provided a suggestion could still benefit, even if they’ve declined to share that (potentially personal/identifying) data with others. And even just the ability to add a route combination to the list, even if I have to do it every time, would be an improvement over not having that and being limited to whatever options the algorithm picks for me.
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