Hi Greg—
I have a couple of responses to this:
1) Re: whether print or online is better, there are advantages to both of course. You do a good job of outlining the advantages of print, but online has the advantages of being searchable and “surfable” (containing hyperlinks to related information, to let you instantly see the list of steps in a referenced subprocedure). Also, in many circumstances, it is more portable. You can load an entire 747’s worth of maintenance manuals on a laptop (or access it remotely on a tablet or even a phone in a pinch), but you’d better have a cart handy if you want to bring the printed version out on the tarmac.
2) Re: authoring systems, there are many advantages to structured authoring beyond just the (often unfulfilled) promise of content reuse. They include ease of translation (where a lot of companies get their real monetary ROI), separation of formatting from content, and enforcement of authoring standards (through DTD/Schema and additional systems like Schematron for enforcing business rules). With desktop publishing systems like InDesign or Word, my experience is that authors can’t resist spending a lot of extra time tweaking formatting and (inadvertently) introducing inconsistencies in content, which a copy editor then has to spend time undoing when the full document base is assembled. Structured authoring removes that temptation, so authors can focus on producing good, consistent content and leave the formatting to the stylesheet.
--Clay