I disagree that building an app in 30 days is "stupid." For some applications, a v1 in 30 days is entirely possible/reasonable. You have to consider the app you

I disagree that building an app in 30 days is "stupid." For some applications, a v1 in 30 days is entirely possible/reasonable. You have to consider the app you want to build and who you're selling it to. Some people are content with an MVP backed by a solid vision, others need something more substantial. Nobody's wrong here, it's totally based on the needs of your customers. The important part is that you understand this and approach it appropriately.