I did Taylor -2 a few weeks ago so I don’t recall exactly how I felt.
https://www.trainerroad.com/career/neilj/rides/51248042-taylor-2
My HR at the end of set 1 was 160, which is about where I would expect to be at the end of a 10 minute sweet spot interval. For an alleged VO2 max workout, that classes as super easy for me and it seems I am not alone. I wouldn’t expect to be breathing particularly hard at that HR.
I was concerned that I didn’t get the intended training benefit from this workout, to the extent that I replaced most of the rest of the VO2max workouts in SSB LV II.
Instead of Bluebell/Mills/Spencer +2/Pettit I did Baird +2 at 105%/Hurd -2/Spencer +2/Spencer +3.