To me it was a good analogy. But I think the key for me thinking it's reasonable is that I go into Show HN posts with milder expectations than other submissions

To me it was a good analogy. But I think the key for me thinking it's reasonable is that I go into Show HN posts with milder expectations than other submissions. I would never pick MongoDB over a traditional relational database, so I can't judge this well, but I can still see how people would find it useful. Nice work!