The community had a debate on this when it was implemented. One of the fears was that people with Taos would just default the Unfrozen set, and not have to sacrifice the rest of their gear to get 100 MDEF to be Freeze immune, and that entire roles (Frost Joke Maestro, Jack Frost Warlocks) and an entire status effect (Frozen) would be removed from WoE.
That's exactly what happened.
We were told that the GMs would look into making it not work with certain cards so that the OP combinations wouldn't be OP.
That never happened.
There was also the fear that since you had to be VIP to even do the event, and it was an RNG based event that not everyone would get a set and we would never see it again.
We were told that the set wouldn't disappear completely and that it would be available to everyone eventually.
That never happened.
So now we have this ridiculously OP set, that only people that paid for VIP during the month of February 2016 have a CHANCE of having access to. Anyone who either wasn't VIP, or wasn't playing RO on Renewal, or had no interest in WoE 9 months ago are now permanently -_- over.
I use the set myself in WoE, it's a -_- godsend. I can just default a Tao, and storage my black rosaries to have Megs, and only have to toggle garment/footgear (woe robe/shoes -> GFSS/Temp Boots) to change between defense and offense. I no longer need Gibbet BFGs for MDEF, or an MDEF enchanted Long Mace, I can just default a KVM Mace knowing full well that the only counter to that was removed for just me and a handful of others because we just so happened to be VIP during the event 9 months ago, and were lucky enough to get a set and upgrade it. I no longer have to worry about Storm Gust, Jack Frost, or Frost Joke. Those skills are practically, if not completely, worthless now. The set is OP, anyone who thinks otherwise is trying to downplay it so they can keep their advantage over everyone who doesn't have it.
That advantage is only available for the handful of people that just so happened to have VIP 9 months ago on the account they want to WoE on today. All anyone else can do is -_- off and cry about it.
That's a fantastic message for anyone looking to get involved in Renewal WoE now:
"You're upset because a fantastically game changing set of gear with no downsides and no counter is no longer available to you because you weren't giving us money and playing on this exact server on that exact account 9 months ago? Does that really bum you out?"
Just disable the set in WoE until after a way to make it available/fair for newer players actually gets implemented in game. Or better yet just make it permanently disabled in woe/pvp. It's not the only change that needs to happen, but it's at least step in the right direction, and one that iRO can do on our own.
Or don't, and tell the people who want to join WoE on an actual fair playing field to go -_- themselves and find some other game to play.