Well you seem to be missing the fact that there have been reports of the same problems even on PB4 and PB5 - less perhaps but then there are many less people running the betas. It's enough to know that the betas so far are NOT a guaranteed fix, so why should people make the effort and take the risk of installing them if they don't want to?
For the record, launch day (samsung) 6S 128Gb, still 9.0.2, on the charger every night, no problems whatsoever with either waking up or home buttons getting warm. I have to wonder whether it's at least partly hardware for some people.