[Domenic_S]

Not to sound trite, but that sounds like a lack of planning -- in the form of a question, what's your MVP?

If you're clear on that, you point to the doc and say "how does this new idea/feature help accomplish this?" and force a specific answer.

[NameNickHN]

It was all planned out and I myself had a clear path outlined but if your partner is supposed to do the marketing and PR and simply refuses to start with it, what are you going to do?

[Domenic_S]

That's the other big piece of any business: buy in. You can have the best project roadmap in the world but if everyone else acts like it doesn't exist it's not very helpful!