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Nintendo Switch Limitations...
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I don't think PS4 will be the minimum spec for 4.0. This time it will be the pc, because some people have very old computer less capable then the PS4 and i can't see Square making the specs so high, that many people can't play anymore. In my opinion, the Switch has to be at least as powerful as the unnanounced pc specs are, but not above PS4. The PS3 was another matter, because it was just to old and the amount of RAM for example is just far to low for 2017 imo.
This thing looks like a very gimmicky dockable PS Vita with a more recent hardware refresh. The controllers look terrible and the docking base looks essentially like it provides TV output and external IO support that the handheld doesn't do itself.
Had Sony created a cradle for the Vita that had HDMI output, this would essentially be a modernized Vita.
Shoehorning FFXIV onto this p.o.s. would in many ways trigger the console limitations arguments again.
Nintendo hasn't announced the specs yet. So your link just leads to a rumour based on an unknown source. We will find out about the specs, when we get our hands on. And even then, nobody of us knows if FF14 will run on NS, because only Yoshi and his talented team, know the limitations of their engine, the game, the console and upcoming features they want to add. I think it is pointless to say either "yes, it works" or "no, not at all", like some are doing in this thread.
Switch is weaker than ps4 plus Nintendo crossplay would be an issue