I see that you work in software security. Your list of sufficient criteria for Wikipedia relevance, alongside obvious ones like "been in the news" and "authored a book", also includes ones like "discovered a critical vulnerability (or blazed a trail of minor ones)" and "run security for a Fortune-500 company or government agency".

These are rather specific to your own field of interest, and probably someone unfamiliar with software security would say they aren't notable. Consider that you're doing the same thing in deleting well-written articles by other people, ignoring what makes them notable/relevant/useful because you're not familiar with the subject.