I think that the programs, back in the days, were not many thousands lines of code. They were small, and did only one or two things. Each program doing one thin

I think that the programs, back in the days, were not many thousands lines of code. They were small, and did only one or two things. Each program doing one thing reliably with a simple interface, and you can call it from another program, and build something big from that. But still, they are all small pieces of code.