[Vegenoid]

I think that it depends on what you mean by “people”. My hypothesis is that the average person today is better at learning than in the past, for the reasons you stated, but that there have been people as good at learning as the best today for quite a while. It seems hard to refute this when considering some of the great minds of the past, and the incredible discoveries they were able to make with far less tools and collaborators with which to make them.

I also don’t think that brainpower/learning ability correspond as directly to training regimen as physical ability. We also don’t have as clear of an idea for what the “best” ways to increase learning ability are as for fitness. And of course our methods to quantify intelligence are much less objective than for fitness - partly because we separate fitness ability into different domains in a way that we tend not to for intelligence.