they do care, but they will re-act based on QQ from players doing leveling BGs. the reason BGs had to be made 0x-x4 & x5-x9. was because the 0x-x9 BGs were no longer fair and valid based on talent, glyphs, etc, over the years. scaling will not fix it and make it fair.. i see nothing that will make going back to those brackets fair or even close to balanced
in higher brackets they made 70's arena allow 71-74's several times and had to renerf it to 70, not because of 70's complaining, it has been changed because players gaming the arena system to gain points within a season, allowed to keep points and if they then powerlevel they keep the ratings. blizz reacted by nerfing the brackets back to 70, 80, 85 only, and wiping prior ratings, etc. when they hit 90. it was a result of existing 90's noticing about a new 90 already having ratings and ability to purchase arena items instantly that brought about the change. if it only affected 70, 80, 85 level players they would have done nothing which is exactly what they did the first half of the MOP expac, but hey affects 90's...shit happens then