How would your ERG trainer react in this situation? The range of power in L4 is 90-105%, so the Garmin workout pegs it in the middle, i.e. 97%.
As someone that uses a non-smart trainer, it’s easy to increase/decrease power based on how average HR is tracking; the goal would be to have minimal cardiac drift.
There’s a good argument for having a “range” of values within a zone/level. If my athletes are supposed to do a workout at VO2max power, and they struggled on the previous workouts, or are feeling a little fatigued, I’ll tell them to keep it closer to 106% and see how they react; the first and last interval needs to be the same for it to be effective. Likewise, if they’re feeling good, then I’ll ask them to push it closer to 120% for all intervals. It’s still within the same “zone/level”. The % doesn’t really make a difference, and nor would having it a “zones”. Executing it is key, and being able to review it afterwards is all I’m really interested to see.