Supply chain npm vs PyPI: I compared both simulations and the most dangerous vector isn't what everyone thinks I'd just finished the PyPI post, closed the terminal feeling good about myself, and then sat there staring at two result files open in parallel splits: npm-simulation-results.json on the left, pypi-simulation-results.json on the right. The numbers looked different. Too different to ignore. I hadn't planned to do this cross-analysis. It was one of those moments where the screen talks to you if you actually pay attention. Three hours later I had a thesis that made me uncomfortable enough to write it down. My thesis: npm gets all the scrutiny, all the articles, all the Dependabot alerts. PyPI lives in an operational blind spot for most backend teams — and that blind spot is exactly the vector attackers are exploiting most consistently in 2025.…