the original default location in NeXTstep is on the right. i don't agree with the mouse argument because i don't need to constantly go there to access apps. i mean starting/switching apps is not the main activity on the computer. i want the dock visible but out of the way.

that said, reading the linked article it appears that the dock in OSX is not just a reskinned version of the NeXTstep dock, but written from scratch on MacOS9, and only then ported to OSX afterwards. i find that surprising.