In the workout, I am used to seeing blue bars. I don’t think colours would affect the outcome of the workout.
In the analysis (using intervals), I am used to seeing coloured bars. I don’t think a lack of colour would affect the analysis I want to do.
I mentioned previously that my HR armband changes colour depending on HR zone
and, for those that really want colour, a smart light can be linked to a trainer / hrm / zwift to illuminate the pain cave in a colour according to zones