The low volume SSB plan actually has a lot of intensity, and the base 2 plan has VO2max workouts. One of the most common criticisms of the plan is that it has too much intensity, and basically no sweetspot workouts (they are low threshold). And of course the intensity is progressive over the duration of the plan, as is time-in-zone. So I don’t think this idea about not enough intensity to build for the ramp test after ssb2 is true. Total volume may be on the short side.
There is also a thread on here somewhere where someone compiled FTP increases from different plans. The LV plan doesn’t perform much worse than the MV plan, so I don’t think @KorbenDallas’s point about plateauing happens either. I don’t know if you really plateau within 12 weeks, coming from no training at all?
Edit: this one: TR makes you this much faster – 185 data points and a model