The most accurate response to the question about the benefits of having a comprehensive troubleshooting plan covering all possible test cases is:
No, a troubleshooting plan covering all possible test cases from a given category could involve extra work, be redundant, and prove unproductive for improving the product.
This response acknowledges that while having a thorough plan can be useful, it may also lead to unnecessary complexity and inefficiency if it attempts to account for every possible case rather than focusing on the most relevant and impactful issues.