AoA hinted that we COULDN'T win, not without passing some kind of spiritual test by the Vishnans
If that's what you think, then you have utterly failed to understand the real problematic behind the BP universe. There are many indications in AoA and WiH that we shouldn't consider the Vishnans as a helpful, benevolent force, and it is obvious that they are pursuing their own agenda, in which the true role of humanity has yet to be determined.
As for the "we can't win" part, or to be more precise, "we can't beat the Shivans from a military point of view", it's not a BP thing. Canonical FS2 pretty much states it clearly when they throw 80 jugs at you and blow a star for teh lulz.
One of the main reason BP has become so popular is actually because it's not a standard militaristic campaign à la FS1-2. We already have dozens of those.
I didn't say that the Vishnans were benevolent.
Your own words illustrate the problem I have entirely: 'the true role of humanity has yet to be determined'. I don't like that we are tools in someone elses agenda, or rather, that we don't have the option not to be, and I don't like that if we survive, it's essentially because of cosmic luck. The conversation between the Dante and the Vishnans Lulzwtfernought about the 'Brahmans of old' implied that any victory we might achieve was actually simply pre-ordained, which as I said, feels like it devalues the previous victories we have drawn.
On the topic of the 80 Sathani (correct pluralization?):
Canonical FS1 stated that the Lucifer was invincible, and then that same canon found a way to overcome. All hurdles are surmountable, sometimes it's just more difficult then others. What if FS1 had ended with the destruction of Vasuda Prime, and we found a way to break the jump nodes to Shivan contested systems, hiding in the heart of Terran space. Would you argue then that 'canon proves we can't beat the shivans because the Lucifer is invincible'? It's a fair argument, but my response would still be the same: A way exists, we just haven't found it yet.
A representative from Volition said that they had planned a GTVA offensive into 'Shivantown' in FS3, but that it wasn't any more hammered out then that before FS3 got cancelled. Since he said quote: "go on the offensive" in reference the the GTVA, Volition clearly thought the GTVA could overcome 80 jugs, or at least had planned a way for the Security Council to
believe it could.
So no, I fundamentally disagree with your statement that canon pretty much says the Shivans are unbeatable because they fielded a bunch of really nasty ships.
Finally, I know that's why BP is popular, I even said that I enjoyed it a lot. As I said in my post, it's simply a route I wouldn't have taken had I been on the story team. I didn't say it was wrong, or bad, I just gave my perspective had I been in their position.