By extension of that logic, engineers basically shouldn't write anything except very high level application glue code, and only that as a last resort. Rely on l

By extension of that logic, engineers basically shouldn't write anything except very high level application glue code, and only that as a last resort. Rely on libraries made by people who are domain experts or at least have a lot of eyeballs and users, because _every_ problem domain has a lot of ugly warts and major issues. People warn about time and encryption specifically because these issues can be subtle and take years to be exposed, but the same is true for lots of others as well. Don't write your own parsers, network libraries, locking primitives, data structures, filesystems, databases, etc. Except of course, sometimes you have to.