Strictly speaking, they probably aren’t only tied to that because obviously there are outliers. Hopefully some smart humans put some thought into the progressions and workout levels. But the end effect is you progress every workout every week and continuously grow CTL until the AI box tells you your FTP goes up based on the workouts the AI box prescribed you and you start over again, all while not really recovering (because TR recovery weeks are just lower volume endurance weeks, not actually recovery). Regardless of how you parse it, intensity progression for the sake of progression results in stagnation.