My first point is that some IT people may regard the business architecture domain as a dumping ground for anything that doesn't belong anywhere else. For example, TOGAF 9.1 includes a skills matrix and set of job descriptions in the business architecture (Chapter 8), and I found a framework called Lite EA that includes staff demographics. There is perhaps an idea that the business architecture includes all non-IT aspects of the solution architecture, including physical processes as well as human activity.
My second point is that business architecture doesn't just mean a complete collection of business-oriented IT requirements. Maybe some of the staff work from home on Fridays, and this has some important implications for IT systems and infrastructure, including security. However, people sometimes working from home does not affect the structure and behaviour of the business, so it's not really business architecture.
My third point is that a lot of these frameworks have evolved from earlier work, dating from an era when geography was (a) more significant and (b) more straightforward.
My final point is that physical location belongs to an entirely different domain, which I want to call Physical Architecture, which might include office facilities, storage facilities, transport links, and suchlike. These are clearly necessary for the implementation of a particular solution to a geographically distributed business process, just as the computing and communication facilities are, but they aren't part of the business architecture.
This post has prompted two questions on Twitter.
Eric Stephens asked Are locations/buildings just tech? My answer: pretty much, yes. Le Corbusier said that a house was a machine for living in.
Alex Matthews asked Are you also going to separate time as a domain? My answer: I see neither time nor space as architectural domains, but as dimensions affecting one or more architectural domains. Clearly time affects several domains. The argument here is whether the business architecture domain is significantly affected by the spatial dimension. I don't think it is.