Jeremy, I am saying something very simple here and I am sure you and I both believe that a single model does work for everyone. Ride your bike, recover and repeat. The question becomes how far can you take a single model that works for most people?
Times have changed since time-crunched was written. Time-crunched was not based on proven studies it was based on Coggan theory. It’s not that it won’t work. I am 100% sure it can improve peoples fitness… “hey my time crunched atheletes are now faster after doing an SS plan it must work…” Look at the TR forums we know it can work for some.
The point is that new studies have shown that what works for the pros also works for those on a small number of hours. CTL is now more focused on this then they were in the past. Also, in an A/B test it appears 80/20 beats 60/40. Could 70/30 be best for YOU sure but start at science “proven” of 80/20 and then adjust.
So the Coggan theory of CTL=Fitness has now been shown inaccurate (one of the strongest argments for SS plans). CTL is not the most important thing to focus on. Yes, it matters, but which I am sure you agree with only when used in conjunction with the right training / recovery / intensity models. 80/20 gets people thinking differently, not such a CTL / TSS focus.
The single model of poloarized addresses the biggest problem in the industry, amplified in the last few years by the indoor platforms. Too much hard training. The simplest way to help people is to give them a simple formla on how not to do too much. 80/20 addresses that. If you have a great coach then 80/20 does not need to be the focus, but if you have a tendency to do too much then it is a good place to start.