Hi Al
In the original post I did say -
"To help find problems, and provide help in using flexbox, we would be grateful if you would experiment and provide feedback in the use of flexbox for layouts.".
So in many respects we do agree.
In my own experiments with flexbox I have found that fallback css for IE8/9 is reasonably easy to provide, but I also found that some layouts would require more fallback code than that used for the css flexbox, especially if anyone is contemplating IE8/9 to be a responsive layout, (why someone would want IE8/9 as responsive I do not know, as only Windows 7 mobile used these browsers, which has a smaller market share than IE6).
The 'final.html' file in the tutorial does include fallback code for IE8/9, (link to download above video) http://flexboxlayouts.com/holygrail.html
PZ