Sorry, I might be missing something here, but after reading this article - which specific plans does it reference: https://thesufferfest.com/blogs/training-resources/why-work-your-weakness-in-winter
“Even if your weakness isn’t something that’s directly related to your goals, addressing it with one of our weakness-based training plans is still the best approach.”
Firstly, these plans are not designed just to address your primary weakness. What they do is shift the emphasis slightly to take your weakness into account. Each plan is designed to help you improve across all four key metrics—Neuromuscular Power, Maximal Aerobic Power, Functional Threshold Power and Anaerobic Capacity—so you can become the most complete, well-rounded cyclist possible.
So if my weakness is NM / AC - which plan should I look at? Building Blocks AC / NM? Speed Demon? Its not very clear…