Feij: for the vision behind Unity, there's a piece by Mark Shuttleworth that introduces the driving factors behind Unity, how it came out of the Ubuntu Netbook Remix and how it can go forward:
The rationale seems to be sound (see the section starting "There are several driving forces behind ") and the implementation of Unity appears to have maintained coherency with that initial design. The priorities mentioned in the introduction are vertical space shortages on widescreen devices (thus a global menu and launcher at the side) and needing multitouch (big icons).
The focus on building multi-touch interaction for the future is perhaps why today's keyboard methods have received less of a focus. On the particular issue of Alt-F2 being available, my own personal take is that it's one of those features that will help to put users of previous versions of GNOME and Ubuntu back in their comfort zone, and this is what I've stated on the report. Perhaps it would be worth adding a comment from your own perspective:
I don't think it's so much about "them" getting something wrong or right on their own. Getting it right is important, but it doesn't happen in isolation. The tweaks ultimately ripple to-and-fro across all those projects working on making the Free desktop better; you can see that meta influence at work in the infamous image by Frederico Araújo:
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