I always opted for brown bag lunch when working at a company office. It simply takes too long to venture out for lunch, wait in lines, eat and travel back. A waste of my time and money. In many downtowns, it is simply too dangerous to exit company premises to venture off to lunch. Lots of criminal activity.
I understand that is a very real problem today. It wasn't for me before I retired.
In my last working years, I worked in downtown Houston, which was pretty safe. Houston's downtown is not residential and basically closes down after 7:00pm,so we didn't have the thuggish street crime. Downtown also has an extensive tunnel system that connects all the buildings due to the weather, and this is heavily policed to keep the homeless out.
-PJ