> Doesn't using fork make it more difficult to cleanly separate the various child processes from each other?

I don't think so? As long as the main process is separate from the seed process, and the seed process is forked before specialization.

> It also makes address space layout randomisation less effective, because every forked process starts out with the same base memory layout, doesn't it?

Yeah, I think you're right. Not sure if you could maybe do some randomization post fork, but you're probably right.