Helps to do them outside! Unfortunately the first time around I did TB 1 HV inside, in my garage on the trainer.
TB 1 HV back in 2018 and 2019 started with a ramp test and 3 Warrens, followed by these weeks:
@MI-XC what’s your AT customized TB 1 look like?
My brain and bum were so numb that I couldn’t handle that 4th workout 
Mental challenge. Years later I can safely say there is no reason in my season to do all endurance at .65 IF. One exception - after a long break do all endurance for a week or two or three until basic cardio fitness returns.
Otherwise my vote is more endurance, good; all endurance, not good. YMMV.