0,0 for paperspace can either be defined as EDGE of Paper or Inked Area Limits.
This because many could not adjust to 0,0 being the inked area limits for the paperspace 'origin',
as it was originally when Page Setups were first introduced.
Personally I still use and like inked area limits for my definition of paperspace origin.
Others may prefer and or understand that 0,0 is the corner of the paper.
In this instance; where one defines the inked area limits effectively 'redefines' where 0,0 is for the layout.
If one is using 'edge of paper' then 0,0 is left alone. (could be why some prefer it)