Thanks to duckroll and benzy for this.
――Once again, please explain the battle system to us.
Tabata: The battle will be real time action. However, you will constantly be fighting alongside your party members. It is an action battle that emphasizes party teamwork. This battle system is a somewhat streamlined version of FF Type-0's.
Your party members will automatically coordinate their attacks with you. There are many different elements such as weapons or abilities that make it easy to achieve coordination so you might try one combination out and then try another one. It's this sort of trial and error system that I think will be lots of fun for the players to tinker around with.
IMO, Tabata's use of the word "簡易" doesn't mean that the game is going to be super easy. The word "簡単" is more fitting for that. I think that "簡易" is more suitably translated as "streamlined" or "accessible". Again, this is only my opinion.
I think simplified is a perfectly appropriate translation. No one is saying the game will be "super easy", but rather that they're making the controls easier to -use-. They're talking about controls here, not difficulty or game challenge. Streamlined is fine too. But like I said before, I don't think people are worried the game will be too easy, but rather that it's just not what they expected it to be.
In the three Japanese interviews (Famitsu, 4Gamer, Dengeki) I've read today, and the two English ones (Game Informer, Kotaku), Tabata takes pains to express that he wants the action in the combat to be free flowing, and he also points out that there will be strategic mechanics involved in setting put party behavior and your weapon deck and abilities to influence the flow of battles. This seems to have resulted in a lot of automation and "streamlining" like you said. I think it's understandable why people who have followed the early development of Versus is worried about this.
Personally I agree that it's too early to make judgements on whether it "sucks" or whatever, since none of us have played it. It could very well end up as a very fun battle system on it's own merits, but that would require approaching it with an open mind. Some people aren't very capable of that right now because they have waited 8 years for the "Kingdom Hearts" FF game!