One of the things I looked most about the sufferfest videos was the music which had been integrated with the footage. Quite often it’s small bands etc who you may not have heard of but it’s usually appropriate to the workout.
Now that there’s a workout mode with defined ftp% and time duration it’d be good to have music and sound effects to match the on screen effects and your effort.
For normal cruising round the course I usually have my own tunes on anyway but slightly ironically a lot of the music is from the various sufferfest videos.