In YC Startup School, they showed AirBNB's first UI and it was terrible but evolved after users tried it. Many planned features weren't attractive to users and

In YC Startup School, they showed AirBNB's first UI and it was terrible but evolved after users tried it. Many planned features weren't attractive to users and others were needed but missing -- and they didn't find that out until release. The takeaway was to get users to prove that they want your product (features) by paying you, then improve that product.