We all know the correct dock location is LEFT, because there's fewer mouse movements to reach the dock apps and the close/minimize buttons of a window when using a mouse. No further arguments will be heard on this topic (:
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.
Plus, spotlight (or alternatives like Alfred/Raycast) are more convenient app launchers anyways. And switching apps is a bit better via cmd-tab, or better yet, raycast shortcuts or rcmd.
> because it shortens your screen by about 15%!
it doesn't because it's hidden
(Alfred, cmd+tab, cmd+` (and occasionally Exposé) are all I use to open and switch apps outside of the terminal.)
Deep down there it probably extends NSDock or something like that.