How many of the people who are working on any given library actually are domain expert on the subject matter as you imagine? This might have been true 20 years

How many of the people who are working on any given library actually are domain expert on the subject matter as you imagine? This might have been true 20 years ago. But now the cultural shift affects even the people who work on the lower levels. A sort of famous example is how slow Visual Studio has gotten compared to 20 years ago (when it was running on slower hardware even!) where it was nearly instant. The refterm saga has demonstrated that people employed by Microsoft and paid very high salaries to work on a terminal emulator have no idea how to make a half decent terminal renderer. > handrolling is incredibly cost ineffective, yet another source of bugs and can be seen as a bad idea when it comes to security. Without context this statement is blatantly false. Many libraries are full of bugs and security problems.