Instead of trying to serve every single cyclist competing on every level we have targeted our training at normal working folks who are so busy running the human race that they are overwhelmed with trying to think about racing on any other level. For a lot of years coaches have targeted the rider who has cash, time, and ambition. It is our strong belief that only a few of those folks are still racing. Most have dropped out because of burnout or the pressures of everyday life. For the record, our system is not better than TSS and TSS is not better than our system. The difference is we make training that accommodates a lifestyle and not forcing the lifestyle to accommodate the training.
By assigning a value to the WOD/interval "only" the playing field is level for all athletes. You can train with power, heart rate, or perceived effort and as long as you do the interval the score is the same. The field is also even regardless of what CAT you race or how high your FTP is. This is important to CritFit because we are trying to create a social environment were elitism is not welcome and people are coaching each other. Our athletes are Cat 2 - Cat 5, ultra endurance - cross country MTBRs, 20 year old to 50 year old and include both men and women. We have professional strength coaches, dieticians, cycling coaches, and race gurus. All of us come together to create an environment that is unlike any other coaching experience.
One other benefit to the WOD/CritScore is that it fosters friendly competition within the CritFit House. Last month you could do 3 rounds of a particular WOD but this month you were able to complete 5 rounds. Of course all of this has to fit within the confines of sound training principles of build then recover.
Finally, having a WOD only score provides a very easy way to track intensity from day to day and is very measurable. Simplicity breeds consistency and consistency is what really brings cyclists to the next level regardless of your starting point.