Proper TrainerRoad and Zwift integration [Feature Request]

On the initial question about the two app providers collaborating - I’d be very surprised if they did. These collaborations work when both parties clearly gain something. For example, TR + Garmin and Wahoo for outside workouts: this adds functionality to the head units, and differentiates them from their competitors, and adds functionality to TR; so everyone is interested. In a TR + Zwift collaboration, what would both parties gain? Are there a lot of riders who would add a TR subscription to their Zwift one for this? Are there a lot of riders who would add a Zwift subscription to their TR one?