> The concept of Fork was not designed to "spawn new programs", it was created to allow parallelism on a single program with several processes collaborating on the same task. It's even in the name (i.e. you fork the program in two, not spawn a new process).

I really doubt this. Is there an instance of a program with 1st edition lineage that use processes to achieve concurrency? There were pipes, sure, but that could be achieved with a spawn-like call.

I don’t see processes being used for concurrency in UNIX history until BSD sockets and forking servers emerged.