There's one big danger during interviews and that is to focus on features instead of problems. You want them to explain and give you as many concrete and real examples as possible. It's also important to know if the problem you solve is actually valuable. For example, are people paying money for other solutions in the space today? Are the people that make the PDF reports for carbon emissions accounting are they getting paid? Well, if they are getting paid, that's a good sign that this is probably a valuable thing.