I would also really like to hear stories like this. Was so enthralled by Leo's post I ended up making a template for derisking: https://blog.codecorps.org/lower-your-startup-risk-with-this...

These are learnings that doesn't just flit by me. They're not filler. They profoundly change the way I work precisely because of the depth and detail, along with their actionability. Applied learning is by far what I want to hear.