you read wrong, none of what i said on reverse scaling occurred in CATA. in MOP there were no twink BGs in the 75-79 bracket other than leveling BGs
at the start of MOP, them main game was BC capped, then at a point near half way thru MOP blizzard added WOTLK to the base game and opened CATA 10 day free trials. there were a lot of accidental 70 pops to level 71. then months later CATA was added to the base game with MOP 10 day trials.
MOP had some rather insane high level blue BOEs that players as low as 80 could equip, you could fill the rest of the slots with CATA blues from dungeons and quests doing a 10 day free trial
when blizzard during MOP did the reverse scaling in BGs it was really noticed in the 80-84 and 85-89 BG brackets, x0/x1 and x5/6 became really powerful. there were some on this previous version forum that were rather upset. because there were some god mode epics at like 87ish
i played 70s in MOP, so the reverse scaling was not really noticed or mentioned, as most players did not go to 74, there really was no need to. WOW was BC capped, strong community, there was a unwritten honor code to stay at 70. had there been a lot of 74s during MOP reverse scaling, they would have been severely handicapped