This will apply for every game not only WoW, in 2012 (I think not 100% sure) I went 2.2k Rating in 2's here on warmane, I was noob holy paladin (just general knowledge), never used hand of sacrifice / Aura mastery etc, and my warrior partner was some random dude I just met and I found out after some 300-400 matches that he never used pummel and warriors was supposed to use pummel, we we're both like having relentless helm and shoulders and not even bis offpieces.
Going arenas now a decade later there's no chanse in hell that would even get over 1400 rating. People get better, more things / addons -caugh scripts- gets known and the skillcap skyrockets.
The new thing is not about getting honor from doing BG's the most suscessfull ways, It's about boosting up your kill list to show off how pro you are nowadays, thats why these guys even farm ICC entrence or WG whatever PVE spot that has a lot of people attracted to it so they can get some Kills while waiting for next BG queue to pop (remember when the portal to WG teleported you OUTSIDE the door... exactly, that became the new SPOT to be on even to such extent that there was no point in doing BG's at all and some even logged alt account's to join WG just so they could LOOSE, just so more enemy faction players would teleport into their premades waiting outside VoA stairs.)
Well we DO have Battleground's that's for low geared players and once you get good enough gear youl reach the upper BG with better geared people, Many including me think that a 3rd bg between fresh and end game bis would be perfect but it's a question of if there's enough people to fill the queues not only during the day but night aswell.
You are not alone with that mindset though thats exactly why WOTLK classic and Frostmourne gained such success hell, even Lordareon when it launched, But Imo it's all fine and dandy until that very last part of WOTLK comes into play, when ICC opends, and the stats of those end game items just goes to make every single class an absolute unit nuking anyone else down in a second thats not equally as geared, specially ARP classes and shadowmourne users but not to mention the glass cannon mages etcetc.
Thing is also this, EVERYONE wants to be that unit of a guy.