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Ideation - User Journey Map Data
I don't think it was stated in the video but most of the data in the user journey map are educated guesses. Unless you test this task flow with real representative users how can you create a great proposal/prototype that you know with have a high probability of success?
Are these educated guesses common for companies that utilize these methods? Did I miss something in the video?
Dan PoynorData Analysis Techdegree Graduate 62,812 Points
Stages/Touchpoints are probably based on the current Craigslist site plus feedback from the 10 interviews in the Discovery phase.
The Doing/Thinking data is probably based on feedback from the interviews also.
The Opportunities ("Make it easy to...", "Add some verification...") are answers to the "How Might We..." questions. They are just ideas for potential solutions to real problems discovered in the interviews.
The Opportunity ideas could be based on what's worked in other projects, what competitors are doing, industry best practices, etc. They should have some rationale - which might be what you're specifically wondering about.
In general though, the chart should be helpful in defining what a prototype should include for testing.