Jaeimseu
3rd Black Belt
Can you be more specific? Perhaps, as you mention in regards to sport. Though it seems the rules change. But from the perspective of why the martial arts were created, I see modern TKD'ist at a distinct disadvantage vs. those that train old school. Old school had grappling, throws, chokes, locks and a ground component, the same as Karate. I don't see modern TKD adept in these areas unless the instructor happens to toss a few things in here and there.
In regards to strength, actually this is more due to modern chemistry. In the past, considering natural athletes, they were much stronger pound for pound due to old school training methods. Methods which are seeing a resurgance in popularity because of there effectiveness.
I mean in terms of achieving whatever training goals you have in mind. I don't train with a purely self defense mind-set, nor do I believe most people train that way these days. I think people have a variety of motivations for training, be it health, social, sports, or self-defense. I believe that with few exceptions the majority of people will be better served training with modern methods. You obviously feel that the old ways suit you better, and I really have no issue with that. I don't believe newer is better simply because it is newer, but I don't believe older is better because it's older, either.
As far as natural athletes in the past is concerned, I don't think we can accurately say they were or weren't stronger pound for pound, but we can accurately say that they weren't competing against other athletes training with today's methods. These days it's not enough to be a natural athlete. Simply being a natural athlete won't get you to the top.