with PVP going fixed template similar to FPS games like OW, COD, there should be no excuses on balancing players down to 1 vs 1, 2 vs 2 again. they have claimed they can balance PVP due to this since adjusting the PVP templates are separate from PVE
DEVs used excuses of PVE performance, gearing variations, gems and enchant choices making balancing extremely difficult on the past, on all levels of players. in the past they claimed they focus on end level...
2 vs 2 balancing was dropped in WOTLK, after excessive QQ concerning Fmage/Dpriest comps, rather than nerf a mage, they announced they no longer balance 2's, dropped 2's ratings for use in gear purchases, since then 2's has been relegated to FOTM (expac) OP classes dominating and/or being able to 1 vs 2 carry for free points and achieves
problem is that classes OP 1 vs 1 and 1 vs 2 carries over into 3's and BGs as well. hopefully blizz does balancing faster in legion and not ignore them for long periods like they did especially in MOP and WOD