Tried it. The TR model is not unscientific, it is counterscientific. There are many valid models out there, trainierroad ist not one of them. There is a certain relation between efforts and Trainerroad throws that all out of the window and lets you - on the high volume plan, ride 5 Zone 4 efforts (because their so called sweet spot is in fact Zone 4 - subthreshold in most models) out of six workouts per week. This is simple not sustainable training (except if you are a 20 hour per week rider who can only ride 10 for a while, than it might work … for a while).
If you do a pyramid model, read the forum posts by Michelle Ferrari, 40% medio but medio being 85% not 90-95% of FTP. And limit Soglia work (90-100% FTP in Michele Ferraris world) to 40 minutes per week. Which leaves more than 50% for lento and L-Lento. 55% Lento and L-Lento - 40% Medio @85% and 5% Soglia. And Sweet Spot belongs mainly into the soglia category.
TR is a short term fix, the intensity is too high for long term development. Being tough for being tough sake is easy, just do 400 windsprints and 100 burpees, throw up and repeat. You get fit for a few weeks and then burn out. About the FTP estimation … 75% of the max. 1 min power is not FTP. It overestimates FTP mostly which makes intensity in the upcoming training even higher.