Earlier quoted context omitted.
>> We need big thinkers > We need some, but there aren't anywhere near enough big-thinking jobs Ok. Perhaps we also need jobs for them? [EDIT: what I mean is, perhaps it is in society's interest to divert some resources to creating more jobs for such people?] And perhaps the research itself, that these big thinkers do for their PhDs, has important value for society?
Diverting resources sounds good, but obviously should come first. The research itself could and should have value. But a PhD must go all the way to the bottom, in terms of detail. It's not a pop science book or a funding programme, which can delegate the details to someone else. Therefore, asking the PhD student to be a big thinker as well as taking care of the experimental details is just raising the bar -- it's not…
> Maybe the big thinking should be done -- as it is currently -- by people who have already demonstrated that they can do all that very well.
I completely dispute this. I would bet that historically, the majority of "big thinking" has been done by people who are not already well established.
In fact, I think there's a fallacy that "big thinking" somehow comes from accumulated experience. I would argue that "big thinking" is actually a different kind of thinking, one that requires you to have that kind of thinking rather than a wealth of experience.
[EDIT: there seems to be empirical evidence that having a wealth of experience tends to prevent people from coming up with (good) "big ideas". And since this is Hacker News, think about this in terms of technology and startups. Is it usually older people or younger people who tend to come up with the game-changing tech developments?]