I could be wrong but it seems to me that the difference is that your previous method of training is very limited in delivering sound results for fitness but perhaps some results in strength. I would not divide the two methods up into yours being good for crits and others for longer road races. Base fitness is the foundation on which any strength training must take root if you are to be a successful racer. If you've got the strength, but lack the fitness to use it at the end of a 45 minute crit, road race, TT, or whatever, what's the use?