They're not "dismissing" them per say... as many people say, there are a million ways to reach the same conclusion; they simply remove what is redundant and go for the more powerful alternative...
haha, theres somehting funny about that, embed and object cannot be xhtml compliant unless you know what you're doing... I ofcoarse do when I try (I've never seen a fully xhtml compliant flash embed code, other than the one i spent weeks customizing for my personal use).