Francis, while I agree with your concerns, I do want to try to clear up one misconception you have.
You seem to think that individuals are the customer for MS. Sorry, but MS designed the ribbon specifically for itself and its corporate customers. The QAT was a sop it created for individuals to show that MS "cared" for them. What has happened with the
2013 QAT, and even more so with 2016, shows how "much" MS cares about supporting this type of user customization.
This article: http://blogs.msdn.com/b/jensenh/archive/2006/06/27/648269.aspx talks about why MS switched from the "totally customizable" menu system to the locked down Ribbon. It was for the benefit of support groups, MS's support and corporate support.
During the 2007 beta, apparently you could add groups to the QAT. (see the image in this link:
https://web.archive.org/web/20101006220612/http://blogs.msdn.com/b/jensenh/archive/2006/03/14/551142.aspx and see this page: http://blogs.msdn.com/b/jensenh/archive/2006/03/14/551142.aspx ). But I guess that feature did not make it into the final cut.
Even in the original design of the QAT, it was only envisioned to provide MINIMAL opportunity for customimzation:
<Snip http://blogs.msdn.com/b/jensenh/archive/2006/09/12/750144.aspx >
The Quick Customize Menu is not a revolution—but it's a nice affordance to improve the discoverability of customization for beginner/intermediate users who are most likely to want to add just a few simple commands to their Quick Access Toolbar.
</snip>
If you want to learn more about the (ir)rational that went into the design of the Ribbon for 2007, there is a VERY LONG series of blogs by one of the Managers on the team. This page:
http://blogs.msdn.com/b/jensenh/archive/2008/03/12/table-of-contents.aspx
has links to all of the blogs presented in a more rational order than they were originally published in. It actually makes interesting reading, especially the section on the various iterations they went through, but it is very long and requires a major
investment in time if you want to read the whole thing.