I think having good range is overrated, unless the aim is mediocrity. I can think of only two people at elite level who have the kind of range you describe: Sifan Hassan and Mo Farah. Every other elite runner who is capable of winning medals has specialised. It's a similar issue when we compare elite marathoning: US athletes see the marathon as part of their range, something to move onto when they are past their best. East Africans specialise early so you get athletes like Brigid Kosgei in her physical prime training specifically for the marathon going against US athletes at the tail end of their careers who are basically trained for track but have added mileage for a couple of years. And then you ask why don't Americans compete? So year, the concept of "good range" is a myth in elite running. Where was David Rudisha's range?
You're forgetting aouita the cheater