I didn't see any benefit in interviewing users, for me the willingness of users to pay for my product was much more valuable and in general I am an adherent of Paul Graham's concept "Do things that don't scale". You can read about it here https://www.paulgraham.com/ds.html
In short, instead of asking users "will you use my product?" it is better to launch an MVP and try to sell it to the first users and then draw conclusions