In the following years the Mac and its software was shaped by the people using it and developing as much, if not more, as by Apple itself.
Desktop Publishing was one of the areas where the Mac first showed in a practically useful form (1985) that its base was useful. But it was not new. ALL the basic ideas existed in the Xerox Star ( http://en.wikipedia.org/wiki/Xerox_Star ): laser printers, document publishing, layout, networked workgroups, user interface metaphor (the office), page description language, object embedding, ...). Apple designed the Mac to be much more affordable - but a useful system with disk, large screen, network, memory, laser printer added up to a substantial amount of money.
I'm not sure that I can name ANYTHING in early Mac-based desktop publishing that was not already presented in some form in the Xerox Star - the implementation of Desktop Publishing on the Mac then was joint work of Adobe (Postscript), Aldus (PageMaker), Canon (the laser printer) and others.
I don't believe in a company that thinks it can define the 'progress of a platform'. In my view progress it is a joint process by many people and companies, a process of ideas, implementations, failures, retrying, improving, feedback, ...
For the iPhone OS developers are degraded to do what Apple pleases. Innovation is no longer happening between people on the same level - Apple thinks it can control the process and the results. I think that leads to a shallow form of progress and innovation.