Let's not over-simplify or over-generalize things....nowhere does Tom Schwartz say that CV is a magic bullet and the ONLY pace to train at. In his means of prescribing training it might be the primary pace in the majority of workouts to help achieve improvements associated with both LT and vVo2max, but it is just one training pace of many he and most everyone else uses in training.
He advocates tempo runs, although his tempo runs also tend to be slower than other people's definition of tempo runs.
He advocates faster reps like vo2 max, and mile pace and 800 pace. He just tends to prescribe less of that than might be considered "contemporarily traditional."
He advocates volume, but instead of running the 100% maximum any individual can handle, he feels that a marginally lower percentage of that will give you MOST of the physiological improvement, but MUCH lower risk of injury.
He advocates consistent and moderate training over time to both stay healthy and allow for natural progression, through a variety of paces. He advocates nothing too harsh that pushes the envelope toward injury through either excessive volume, or excessive intensity.
There are many ways to train, most coaches know all the ingredients, and most coaches combine them in similar yet slightly unique ways when compared to one another.
As someone that had been a "speed/power" coach for more than a decade, I wanted to expand my skill set into endurance and cross country coaching. Tom was a mentor that helped to explain complex things in simple enough way to speed up my development as a distance coach. I consider that the sign of a good teacher. Almost a decade later I am incredibly happy with the successes we have had in both the "speed/power" events and in the endurance events. I too have my own slant on things now, but Tom's teaching was my starting point.
He feels strongly about the things he has studied and learned, and the personal slants he has put into his training design based on research and practice. Like with any coach, the more "talented" your athletes are when they show up at you door, the more likely you are to have success. So now that Drew Hunter is working with him, he is receiving (rightfully so in my opinion) more attention.
My opinion is he is also not doing anything "special" with Drew that he hasn't done with local master's runners he has worked with for years. It's just that the local master's runners improvements don't garner national attention.
Using his calculator, in my opinion is a good idea. If you have followed the message board opinions you will see that many people have reactions like "that seems too easy, or too slow, or too little volume." If you read interviews from Tom you will see that his opinion tends to be that a lot of people tend to overdo it with harsh volumes or harsh intensities. So that is just part of his slant on training design.
Everyone is entitled to their opinion, and everyone is entitled to implement, or experiment with or learn about any kind of training they want. Nobody is intentionally trying to advocate BAD ideas. Nobody intentionally tries to prescribe ineffective training to their athletes.
Just be careful not to over-generalize something based on your currently incomplete understanding of the full topic. enjoy learning and sharing.