My thoughts also. My advice (and what I remember from other coaches / podcasts) for most users would be to set a more conservative / 1 hour FTP and do longer intervals. For me this means to progress through the zones to workouts with levels > 8.
But I’m coming from a WKO / Cusick…extensive aerobic…intensive aerobic…VO2max progression style.
And what I’m not getting is that TR seems to prefer (or be more cautious by using) shorter intervals on higher (maybe ramp test inflated) FTP. I’d say keep FTP conservative and progress high into workout levels (before retest) instead of testing/nudging FTP regularly and staying lower on workout levels (and therefore lower interval length - even if FTP is bit higher). (Maybe something for the pod to discuss @Jonathan)
Still happy with the workout levels (good guide for all training approaches) and will be interesting to see them unfold with AT!