I'd like to disagree with that as strongly as possible; I'm not even sure how you could have come to such a conclusion, in fact.
We just went through FFIV, where it was amply demonstrated that the heroes failed, kept failing, and then failed some more, all the way to the end, and nearly two thirds of the boss fights in that game were entirely meaningless, nearly as much as the heroic sacrifices that followed some of them to stop the disasters that winning those boss fights completely failed to prevent. It's ludicrous to say that the team in FFV is less competent than the team in FFIV - that's just not true. FFIV had perhaps three victories that mattered, which includes the final boss; FFV already had more of those in what we've seen of the game so far, and we're just three updates in.
FFV isn't perfect or anything, but in terms of story-driven failure, FFIV is so much more egregious, there's no possible ways to compare it.
I'll hold back any comments on whether FFV story is better than FFIV or not to avoid spoliing Omicron on it - as I've said before, experiencing FFV completely unspoiled is an experience truly worth having - and obviously on commenting at all about FFVI for the same reason, but to say that FFIV has less instances of "we beat the boss, but the plot acted as if we lost!" (we've just got this one so far), and that this is the reason FFV wasn't translated, seems very silly to me.