There is much more to learn. There are more unknowns. And there is much more competition.
If you take competitive sports and look at size of support stuff its ridiculous these days compared to 20 years back. There is coach, physio, shrink, nutritionist, biz manager, social media manager etc
So now extrapolate and imagine what things will look like 10 years or 20 years from now on the that trend line. Its just not sustainable.
People have to think about rate of change in the environment that surrounds us.