The first link you referenced contains a chromium dev stating the flexbox spec was stable as of summer 2012. This is an example of a secretive Apple not being transparent about why they lag behind the rest of the industry. This behavior helps no one.
Sorry, I'm not sure I get your point, are you referring to this comment:
2012-08-31 Tony Chang <tony@chromium.org>
Remove ENABLE_CSS3_FLEXBOX compile time flag
https://bugs.webkit.org/show_bug.cgi?id=95382
[..snip..]
Everyone is already enabling this by default and the spec has stablized.
If so, as a honest question, I'm not sure how is this comment related to, or why should it be an example for Apple not being transparent about why they lag behind. Can you clarify?
