It would seem from the limited view of 'business software' that you either
work in a rather small company or have little exposure to other aspects of
it. Take, as but one example, this site's listing of (Enterprise)
'business' software solutions.
http://www.capterra.com/
A dern sight more than simply "converting documents to printable form."
However, that particular matter is largely moot as the context wasn't which
software packages are called 'business software' but what criteria
companies use in choosing their computers, which brings up what companies
use their computers for.
And, regardless of which subheading in the software catalogue you feel they
should be listed, companies do, among other things, "art, engineering, and
science" in the course of their 'business'.
You're actually making one of my original points; that companies, or maybe
I should have said "smart" companies, buy computers that fit the job.
That's a very limited view of "business computing". As a broad category,
e.g., decision support systems can do some very heavy duty calculations,
whether it be financial analysis or strategic & tactical planning for any
part of a manufacturing business.
The original post from manny didn't show up on my server so I hope you
don't mind my piggy backing on your reply.