As a professional Decathlete I can say I have done CrossFit workouts and they are basically what we would do in the off season. For the short time I tried CF I still went to the track after and did my normal workout, I was using the CF as a general warmup. CF is not for the professional athlete looking for performance gains. CF is about being fit, and for the general population CF is better than many other workout routines, but for performance based athletes I personally do not see any gains for doing CF, except maybe some variety in the offseason, but not for any length of time. Tom Pappas (now that he has officially retired from professional Decathlons) has now opened a CF studio himself, and I am sure he sees some benefit for most people (general population), but CF workouts are very different from what us decathletes do, and in my opinion are not ideal or even close to ideal for anyone looking for performance but mainly for fitness level.
One last point: Because steroids have all these side effects, a lot of abusers will then take other drugs to offset the effect—steroid abuse causes you to grow man-boobs, so people take another drug to mitigate those side effects. Guys who take steroids often also take augmenting drugs to decrease estrogen production or to improve athletic performance even further, like human growth hormone, insulin-like growth factor 1, insulin, erythropoietin, stimulants, diuretics, levothyroxine, and/or gamma-hydroxybutyrate, according to the study in FP Essentials . That means on top of all these side effects of steroids, most abusers are also looking at a whole separate list of effects from their peripheral drug habits.