How is math wing 3.0 this big almighty thing that would completely bring balance to the game? You've already much gotten your answer that ffg isn't going to hire you so why talk and tease about your findings and spreadsheets if they're too powerful to be public information?
He pretty much said as much already in this thread why he won't be publishing it; He's not going to do the work for them for free, as releasing it publicly means FFG has just as much access to it as we do, which is perfectly reasonable.
He can talk about results the tool gives after FFG spoils things, but the value is in the tool itself at the design step. FFG does have its own internal metrics for what things are supposed to cost(as per Jay Little, original lead designer himself speaking at a panel at DragonCon last year), one that they've almost certainly updated and tweaked over time. Not to knock on the guys at FFG, as X-wing is for the most part pretty well balanced, their internal model has clearly made some misteps over the years(Defenders, non-Corran Es, Phantoms, the syck, etc.), but over most of that same period MJ's homebrew model has basically always predicted what community play has borne out from spoiled information. Having that tool to plug stats and the like into at the design step would still not necessarily be a guarantee of 'perfection', because it's still people making both the game and the model, but it could help to avoid having to do things like Title fixes and the like in the future, allowing more immediate, clear feedback before sending things for playtesting which won't be able to suss out the kinds of issues that having the ships in the hands of the community at large will more quickly make apparent, which in turn saves on development time and potentially allows more product to get made.
tl;dr having a more accurate tool for determining stats, dials, etc during the development process leads to potentially faster development of a more balanced game that requires less 'fixing' later...though whether that's necessarily desirable for a business model like the one employed for X-wing(MJ sort of touch on that idea earlier in this thread too...) is a cynical argument for another time.
That said, even though I understand why, and I greatly appreciate MJ's contributions to the community, including 2.0, it does get a bit tiring to see his name for the last year or so and be able to guess the post will contain some variation of "mathwing 3.0 predicts such and such, but I won't be publishing it to demonstrate what I mean." Don't get me wrong, like I said I understand the reasoning completely, I'll gladly take his word for it as he clearly knows what he's talking about. It's just a bit of a tease sometimes that this tool is out there that we keep hearing about which is basically a black box: input goes in, a prediction comes out and so far every prediction it's made has been right, but that doesn't mean we don't necessarily want to see the inside.
I'll continue to take the black box though over nothing though, for sure.