For several years now I have been trying to emphasise the main benefits for a Lean Inception. There are really three things that matter when it comes down to deciding if Lean Inception is the workshop for you needs:
First, aligning and working effectively with the Minimum Viable Product concept and an an
Second, discussing solutioning collaboratively in a give and take between User eXperience, business, and engineering, rather than sequentially (the User eXperience people understanding the user desires and thinking about a design that satisfies those needs, business people writing up business goals and requirements, and engineers building to those requirements).
Third, being very lean from the very beginning.