This structure is horrible. I won't even start dissecting it - just one simple hint: it doesn't even address the second major driver of profitability: costs!

Throwing buckets at interviewers will not be enough to get you an offer. At least not in MBB. What will make you successful is to learn how to think in the proper way. This is how you show that you have a repeatable skill under your belt which you will bring to the table once you join the firm. And this is the rare skill that MBB firms are craving for.

Nobody cares about the length of your buckets and bullet points lists.

Cheers,

Sidi

(edited)

This structure certainly doesn't have any logic. The ideas presented are good, but they aren't organised in any specific order and aren't exhaustive making the answer non-MECE. If, on the other hand, the answers were organised broadly based on increasing revenues and/or decreasing costs, the approach would have made a lot more sense and there would have been a systematic way of identifying the issue and addressing it. You'd also see that you'd be able to ensure you don't miss any option.

I think the structure makes ok sense. It talks about internal factors (product, marketing, distribution) and external factors (market dynamics). I think the ideas within the buckets might not be the best. I think also a profitability analysis - revenue, cost - might be useful.

However, I don't think you can draw the conclusion that Rocketblocks is "harmful" because one of their (user curated?) answers is not great. The tool is extremely useful for you to individually practice frameworks and other elements of the case. If you don't like that answer there are hundreds of other solutions for that problem. I used it and I was able to improve substantially and secure offers. 

Use rocketblocks to get a set of questions to practice but for a good structure I would echo Sidi and Ian's comments