A lot of the fastest people I know already use TrainerRoad, to some extent or another. Pretty much everyone else I know is happy doing what they’re doing, and they don’t really care that my workouts have pretty graphs on Strava. Then again, I had a lot of issues in 2017 and 2018 being consistent enough with my TR workouts to see big gains, so it’s not like people are looking at me and saying “wow, I need to do what they are doing!”
Hopefully that changes with 2019 