These are just two examples for two different families of strategic questions:
1. Strategic Go/No Go Decision (one of hundreds of possible examples is a market entry question)
2. Brainstorming question (again, one of hundreds of possible examples is a “how to grow revenue?”)
These are two out of 4 big families of strategic questions that exist. The categorization into “Profitability Cases”, “Market Entry Cases” etc. is complete rubbish and mirrors the lack of understanding of most established casebook authors.
Regarding your question: I believe you need to learn some fundamentals. Because there is no “root cause” that needs to be discussed for these questions (this would be another family of strategic questions: the DIAGNOSTIC question. Here, you are asked to find the root cause of an observed phonomenen. This is clearly not the case ofr a market entry question or growth question. Unless the growth question is enriched with a context like “Growth has slowed down, the client wants to understand why and how to stimulate growth again.”)
Once you learn these fundamentals, you will have a clear view on any question within seconds. Without these fundamentals you will remain someone who has to rely on certain frameworks and hope that he has seen a similar question before.