This is only true in our existing software ecosystem, where no one bothers to prove any of their assumptions hold (if they even realize they're making assumptio

This is only true in our existing software ecosystem, where no one bothers to prove any of their assumptions hold (if they even realize they're making assumptions). In a software ecosystem designed with provable correctness in mind, open source software would be at least as viable as it is now, while being provably correct with respect to high level specifications which could much more feasibly be audited.