IMO the hallmark of a "senior" vuln researcher is not only their ability to discover/exploit vulnerabilities in difficult targets, but, critically, their ability to effectively *invest and allocate resources*. Knowing when to sink more time/effort into an attack surface or difficult bug, and when you need to stop and *move on* is one of the hardest questions as a researcher, and you only develop that instinct through experience and hard-learned lessons.
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