What the hoopla is about PR? Well I honestly have the same question.
H4-6 are not much helpful in terms of seo benefits
Do Yahoo and MSN (bing) also ignore characters in the title tag beyond 100? Also are you penalized when your description tag is more than 200 or the excess are just ignored?
The study included 71 well known actively working SEO's for feedback on a number of ranking factors.
And second, it is a shame that SEOs ignore the importance or preach against implementation of semantical tags. That is what I hate with SEO if you want me to be very honest.
I did not say not to use them. I always use every possible factor I can. However, the guy you asked to back it up said "not much helpful", which actually goes along with the new data.