The common assumption is that security is a tax on speed — an extra review step, an extra layer of caution, time you don't have on a deadline that was already tight before anyone mentioned threat modeling. But engineers who've spent real time on the offensive side, probing systems and looking for the crack in the logic, tend to write tighter code from the very first draft, not because they're moving slower, but because they're not writing the version that will need to be rewritten later. They're not adding security as a checklist item at the end; they're building it in as they go, because they already know which shortcuts tend to come back to bite a project months down the line. The payoff shows up later, not on day one, which is exactly why it's so easy to underrate in the moment: fewer emergency patches at 11 p.m., fewer 'quick fixes' that quietly introduce new problems, fewer late-stage rewrites because something fundamental was overlooked early.