I think any graduate student (though most notably at the PhD) level, feels the pangs of imposter syndrome at some point. I don't think it ever stopped for many

I think any graduate student (though most notably at the PhD) level, feels the pangs of imposter syndrome at some point. I don't think it ever stopped for many of my cohort and myself. With how much your work relies on the work of others, it's really difficult to divorce yourself from the greater community. The academic equivalent of woodshedding seems frowned upon and unachievable in a publish-or-perish environment. There's a good amount of solace in the realization (or self-deception) that most others are probably as clueless as you are.