This argument doesn't work, because we are told that The Plenty was as close to "perfection" as is allowable within FFXIV's universe, and the entire conflict they ran into was that their world had eliminated every form of "strife" and thus no one had anything to live for. This argument is only possible if you accept very limited specific definitions of the words "paradise", "strife" and "perfect". If, for example, I take a look at The Plenty and decide "No, it's not a paradise, it's certainly not perfect, and ennui definitely counts as a 'strife'", the concept the story is going for no longer works. If the Plenty is not a paradise, nor perfect, then its Dead End was no different than the first two worlds in the eponymous dungeon. There is no abject lesson to learn about the folly of "perfection", because (by this metric) it wasn't one.
But the story wants it both ways. It wants us to accept that The Plenty was objectively "a paradise" while simultaneously arguing that there's no such thing as one. I'm willing to accept the latter argument, but not the former.
Which still isn't the point. "Having a will" isn't an either/or dichotomy where you either have "all of the will" or "none of the will". We can see from Meteion, as well as individual Omicron, that you can very well be composed of dynamis and still follow a basic, routine programming. That is, in fact, the entire POINT of the Omicron. Yes, SIR, has a will -- but none of the other Omicron do (at least, not to a degree as to override their programmed functions). Yet, they exist in Ultima Thule...a place composed entirely of Dynamis. And before the argument becomes "Yes, but the Omicron obey Sir's will" -- the fact that they continue to operate on programmed parameters even after Sir and G'raha disappear would indicate they require no overarching will to operate.
Sure. "Seeing past them". "Driving out". Tomayto-tomahto. Whatever. My point is, Forging Ahead is the game's method of regulating negative Dynamis.
No he wasn't, and no Hermes didn't. I don't know where you're getting that from.
That was the summation of the argument, if you want to ignore the logical steps G'raha took to reach it. Your point here would be like if you had a murder trial, the prosecutor showed strong evidence after strong evidence that proved the suspect had motive, means and opportunity, and then said during the closing arguments, "Ladies and gentlemen, this man is a vicious, deranged killer and I urge you to convict to find justice for the poor victim and make our streets a little safer" and then you come out of nowhere and say, "Wow, what a logical argument."
The entire point is that Sir would not have been able to accept G'raha's solution if he had simply opened with "Hey just open your heart to hope, bruh. Easy.".