While I do like Microsoft Office for Mac, Apple can push the envelope by leveraging its high levels of innovation and the technologies already incorporated in its operating system.
Office for Mac has many shortcomings, and it really isn't a forward thinking software suite. There is plenty of space for innovation, but only a company like Apple would be able to challenge Microsoft's supremacy in the productivity software arena. Most of the advanced Office technologies are reserved for the Windows versions. These are the technologies used by big businesses in their workflow. Medium and small business don't, but they could. Apple could change this, and in time make inroads in big business.
I can't say you're wrong.
I use both the Office for the MAc (at home) and Office windows version (at work).
I can't really say that I have noticed any more features on the Windows version, and in fact the differences I have noticed in the area of user interface heavily favor the Mac version, in my opinion.
Now, could Apple or someone else trump the Office suite? Could be. But considering how entranched Office (Word and Excel) are, it would be an exceedingly tough nut to crack.