That divide did not exist at the time. Intimate knowledge of the systems involved was a requirement to do either task. It wasn't until later that people were ab

That divide did not exist at the time. Intimate knowledge of the systems involved was a requirement to do either task. It wasn't until later that people were able to choose the set of abstractions that enabled them to focus on a task the the point that other considerations could be missed. People wrote entire bespoke operating systems to serve as early arpanet nodes. The arrival of unix was bemoaned by many because it removed this requirement for mastery -- this gave rise to the era of copy-and-paste systems administration and works-on-my-machine development. We're still digging our way out of that hole, by implementing more layers of abstraction. Hence the current popularity of cloud computing: the ultimate copy-and-paste deployment, combined with works-on-my-machine development, where all machines can now be 'my machine'.