TW is low priority for them. It's an old system and they don't care much about fixing "old" especially when they can't monetize it. TW and GAC haven't been updated in YEARS, because there's no money in it for them. One player wins, one loses, same rewards go out regardless. From time to time they prioritize getting rid of cheaters, but they don't seem to have any interest in updating TW or GAC.
Maybe if they sold tickets for those types of PVP events they might do it, but it's doubtful they'll update anything old for free at this point. (no matter what the players want, no matter how many whales down to F2P quit because they're bored or frustrated at the regurgitation of garbage and broken everything.)
It's all about "new shiny!" and "datacrons!" Because that's where the money's at. Brought to you by EA...oh, I mean Capital Games.