You saw one ability and all the sudden we are drowning? Don't you think you are being a bit over-dramatic?
Not at all. Don't even think that we're reacting to "one ability". The game hasn't been announced yesterday ; it's been more than 2 years. They have already shoved a lot of fanservice in our throats, hence some of us feel like puking.

And I insist on the "shove in our throat". They don't only add fanservice, they also exhibit it like it's the main dish and make sure we eat it.
I like the FF series partly because of the references from one opus to another, but these references are discreet so we can discover them (like a mini-game) and they hardly interfere with the game. Here, the fanservice has been on another level for months. And the sword in the trailer bring it up to another level : the devs just don't care anymore. They seem to have a quota of fanservice to fill, even if it means giving a sword to any class, after they've explained how much class identity and uniqueness were important to them (starting as soon as the first letter of the producer).