For me the answer is yes, but my situation is quite non-central. I got into MIT since I was a kid from a small rural town with really good grades, really good test scores, and was on a bunch of sports teams. Because I was from a small rural town and was pretty smart, none of this required special effort other than being on sports teams (note: being on the teams required no special skill as everyone who tried out made the team given small class size). The above was enough to get me an admission probably for reasons of diversity I’m a white man but I’m fairly certain I got a bonus to my application for being from a small rural town.
Counterfactuals are hard, but going to MIT probably helped me to get into a prestigious medical school, leading to my current position as a doctor at a prestigious hospital. People at least pretend to be impressed when somewhat tells them that I went to MIT, despite my undergraduate field of study having absolutely nothing to do with my current job. Since I was lucky enough to be able to attend the university by doing the things I would have done anyway, I’d certainly say the effort was worth it.
I think you added an extra three zeros during your total year calculations. you list 2.23E15 as the total number of years experienced, but multiplying the total time of 5E4 by the current population of 8E9 gives a total of only 4E14 experience years. The true number must be quite a bit lower as the human population was quite a bit lower than 8 billion for most of that time. This also affects the proportion of experience years which have occurred in living memory. My guess is 20% have occurred since the birth of Kane Tanaka and 10% experienced by living people. This also squares pretty well with your figure of 50% of human experience occurring since 1300. It doesn’t really make since for 50% of experience to have occurred since 1300, but only 0.02% since 1903.