Of course they have an advantage no one is arguing that. But i feel you're under estimating how much high level competition necessitates its use. Not all the time but certainly a huge portion of the time. If you understood what these people put their bodies through to deliver what you see on TV you would understand that a large percentage of the world would die trying to emulate them.
This simply isn't true as you have laid it out. You cant simply pump your body with PED's and expect to become Mr.Olympia because of it. Being a high caliber athlete is is a concoction of many different ingredients intertwined. Among them are discipline, work ethic, consistency and of course genetics. Genetically a person who could be anatomically perfect for their sport but when it comes to bodybuilding the genetic component is actually more about how well an individual recovers from his cycles, As well as the insertions of the muscle and how "aesthetic" they seem. If we followed this logic we could assume either me and you could simply pump ourselves up and become champions over night while over looking the component of luck that no amount of steroids could solve. Which we know is bull shit.
Im sorry but this comment is absurd. Again you are reinforcing the idea that things like "skill" and "conditioning" are all of a sudden irrelevant when one administers some sort of PED. Those are way more important to have if you plan on competing in the olympics or in the UFC. And its not who can use the most, it's who can get away with it. This comes down to the compound they use and how detectable it is as well as the politics behind the governing body. Many people test positive and never get reported for it. So a lot of things are not fair but its an unfortunate reality that certain sports wouldn't exist in there current state with out PEDs. Like no one natural is breaking Usain Bolts record, no gold medalist in olympic weightlifting is natural, do you watch football? The NFL is so lax on PED usage that they only check every so often so its not blatantly obvious to the public. But trust me if lived their lives you would be begging for some.