You should be even to those of the same Ilvel and you should actually be at a disadvantage against those of a higher IvL while being able to dominate fresh max levels that are well below you in Ilvl. If, you have the more powerful gear, you should be more powerful. Thius notion that you should be equal to someone 50 iLvl's higher than you is ridiculous. You want to defeat the more powerful players? Get the gear that that gets your I'lvl to equal theirs.
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Just disable the equip bonuses and on-use abilities in BG's and Arena's. Issue solved.
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Because people think that they should automatically be equals to player that are 50 ilvls above them. Stronger players should not be weakened to make those that don't want to gear up feel better.