I've been looking for a way to set my Ai document resolution. I found this discussion.
Indeed, from the programmer/mathematicians perspective, a vector program don't need a logic unit system, because vectors don't have units, by definition.
But the users of this application are mostly designers who deal with unit systems (pixels for the web, cm/mm for print, and often a combination of both).
In my case, the medium I am working on right now is a specific display. This display has a size in pixels, and in mm, and of course a resolution. I definitely need to be able to set my graphics sizes both in mm and in pixels.
Again, the application's usability should not reflect the maths behind the programming, but what the users really need. It's as simple as this (otherwise we would still be using MS-DOS).
Please Adobe, allow your buyers/users/customers/stakeholders to set units and resolutions in Illustrator.
Thanks