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by vacri 3570 days ago
I'll support this with my experience. A PhD means you can do peer-reviewable original research. This means that you can't be too dumb, yes, but mostly that you have the elbow-grease to see it through. Maintaining motivation and stick-to-it-iveness are the most important qualities for doing a PhD.

Disclaimer: dropped out of a PhD program due to lack of interest and elbow-grease.