Talk about setting small goals, is that what you want your career to be? A tiny bump on the surface of the circle of knowledge? If that suits your fancy, go right ahead, but what I want to do is accumulate a bunch of these tiny dents (funded by naive organizations such as NSF and NIH) and burst the bubble like Einstein did!
The post is about a PhD, not the entire career. I really doubt somebody is able to revolutionize physics in a PhD dissertation. The low hanging fruit is simply not there anymore. Later in your career, it might be possible though.
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