Hi Toasted Avocado, you've been making this argument for years. I asked ChatGPT who the most inelligent poster in LetsRun is, and it actually claimed it was you!!
We know that Indians, for example, have rampant doping probably on a similar scale to Kenyans. Yet they still can't get near even sub-elite status. What does that prove exactly? The whole world is in fact doping as hard as Indians? The Nigerian record is something like 3:39. If it transpired that that was doped, does that mean Brits are doping because it's impossible a doped Nigerian can only run 10+ seconds slower than the best Brits?
You also believe that Kenyans have a genetic or some other advantage that isn't doping, despite the clear and proven rampant doping there. Why is the idea that they might actually have a disadvantage that is overcome with doping any less irrational?
I can't say what Kenyans would be running clean, as from the number of doping busts it's reasonable to suppose that virtually all elite Kenyans dope to some extent, and probably have for decades. It's entirely reasonable to suppose that the top sub 3:30 guys would be similar to Manangoi off the juice - struggling to break 3:36.
We also know that Herb Elliott ran 3:35 in an Olympic final on cinders when he was ill, was a heavy smoker, and only started training seriously at the end of the winter. He was also only 22 years of age. Given that this was 1960, and the sport was completely amateur (he even turned down a million dollar offer to go professional) it's hardly likely he was doping, and we know for sure he didn't have EPO or even blood doping. It's quite reasonable to suppose that if Herb Elliot had been around today with all the advantages, training as a full-time pro runner and continuing until his athletic peak in his mid-twenties, he would run sub 3:25.
The fact that East Africans fail miserably at every other sport indicates that their only advantage is in having light frames (itself to a large part environmental), and are not good 'athletes'. It also explains why even Kenyan distance runners need to roid. That and the rampant doping and that virtually all professional sportsmen in East Africa are distance runners. So if there is any genetic difference between Kenyans and Brits, it's likely a disadvantage for Kenyans.
If you somehow could select the best 1 in a million talents from both Kenya and GB, gave them the same identical lifestyle, diet, training etc from a young age, and of course, the same drug testing, then perhaps the British guy would end up running 3:25 and the Kenyan 3:35.
Cheers!