Detect metric system and offer A4, millimeters
It's pretty simple to detect the user country via the OS, so it would be very handy to start indesign with A4 and millimeter units, instead of letter and inches.
Currently, having a fresh install of inDesign, the default page size is letter. To start a new document with A4 is cumbersome. Not good at all, considering that the biggest part of the world uses the metric system and A-sized pages.
Forcing imperial units has no benefits at all, it only annoys the users outside US and Canada.
Iain Anderson commented
100%, just about to suggest the same thing. Every InDesign course I teach, I need to show all my students how to change this properly, by closing down all their documents and then changing preferences and Document Setup. Picas are a nightmare default.