Whilst I don’t disagree that the Full Frontal Test is more intimidating than the Ramp Test, it isn’t that much different to the 20 minute test - only a couple of 5 second sprints at the start and a 1 minute effort at the end on top of the ‘normal’ 20 minute protocol.
The point I was trying to make was that by testing these durations specifically, they can make tailored workouts based on (most importantly in my opinion) the relationship between FTP and power at VO2max.
Take a look at this image from the TrainingPeaks Blog:
Some riders have a 5 minute power that’s a greater percentage of FTP than others can manage for 1 minute power.
I don’t think the importance of getting the correct percentages for work done above FTP can be overstated.
How you go about determining that is another topic…
As for the power curve - that is self determining unless you have a power meter that you can use away from TrainerRoad Workouts, or do testing that is specific to determining some of the critical points on the curve.