Question for Architects

I think this is the appropriate forum for this. It's a simple
question, that I'm sure won't have a simple answer, but it's baffled
me since I've started working with AutoCAD (Release 10). I also
realize I'm making a blanket statement, but I 've never encountered an
Architect who doesn't do this. The question is:

Why do architects not work with relation to real world coordinates?
I'm not talking units, that's a no brainer, but I can't understand why
they don't place their projects in the appropriate location with
respect to the rest of the project? I realize that initial, you might
not have the survery info, but once you do, would it make more sense
from a design AND production standpoint to locate it on the survey.
This way, when you transfer files with you consultants, there is no
fuss and muss about where it should line up and with what points you
should line it up.