And the entire analogy falls apart right there, because the guerrilla war approach they are trying to avoid is something that is far more likely to happen this way. The losing side of a roughly matched war has a much greater ability (in terms of time and of resources) to consider and initiate exactly the sort of backup plans you are arguing the Shivans intend to avoid by this approach. By scattering enemy combat forces across dozens of systems you substantially increase the possibility some of them will be able to escape when the tide has turned decisively. This methodology is the worst of all worlds. The Shivan scouting attempt could be detected providing time to prepare and possibly leading to a discovery of what they are; their victory could be insufficiently rapid or decisive providing time for their opponents to escape; they could just straight lose.
Losing a battle or two is unimportant in the grand scheme of things. What is important is that the technological and strategic paths that these lesser beings operate in are never within a landscape of ideas where they have to think of outmaneuvering a godlike species, just a slightly better species than their own. Those two scenarios are strikingly different. Consider FreeSpace 2 and what has happened until then. In FreeSpace 1, the shivans launch an attack that I can describe as "genocidal" but with merely one technological level higher than they showcase. They risked losing, but if you think about it, in all odds they would have won. The Sanctuary that you bring to the table is proof enough of this. So, against all odds we "save the day" at the eleventh hour.
"But this is madness", you'll say,
"They could have scorched the entire alliance with two or three Sathanas, why didn't they and why wouldn't they?"The difference of the approach is that in the small odds that the subspecies survived a Lucifer attack (level 1), they can scatter all they want and develop new technologies all they want, they
still think their enemy is a Lucifer-building species, and they work with
that in mind. Which means that in this (already assumed very rare) case, the threat is totally contained. They can waste their decades building a Collossus at will, it's just no biggie. There's no "Guerrilla tactics" in there because they fervently believe they have created an anti-shivan solution, a Big Kickass Ship. IOW, this "lost time" is not lost at all.
In the other approach, the survival rate is probably worse. Instead of 1%, perhaps just 0.1%. But consider the consequences. If such a species survives that encounter, they will immediately switch to a mindset of deep space shadow tactic, become invisible through the eons. They will think brainstorming crazy strategies are the only solutions left. Some will inevitably come close to an efficient and deadly answer.
If you have to battle tens of thousands of such species, if you use the first strategy, you'll get hundreds of these species surviving the first strike, but all they can think of next is to build a Collossus or something to that effect. If you use the second, you'll just get a few dozen that survive the first strike, but what follows might be much deadlier solutions in the long run than if you used the first strategy.
An instant death scenario in which juggernauts appear over enemy capital worlds only a few days after first contact is still preferable in terms of preventing an escape and guerrilla conflict. There will always be the 1% with their last-ditch colony ship ready to go the moment they encounter a hostile species, but you're saying the Shivans profit by giving them weeks or months to decide to use it, rather than days. That's ridiculous.
It's only ridiculous if you think on one instance only. It can become (it doesn't necessarily, but it *can*) quite efficient in the long run.
It's not the Shivan timescale you're arguing matters in this post or indeed previous posts; you have been consistent on the point that the Shivans are effectively dumbing down themselves. Their timescale is not relevant to ground conditions as such. The Terran and Vasudan ones, though, are. And on that timescale major changes have occurred.
Only after Capella we see people trying to figure out guerrilla tactics. And I argue that Capella can be seen as an exception. The point of the second shivan incursion wasn't to destroy GTVA systems, but to do something else entirely. They KNOW that to give the information about how bigger the shivans are is a tactical mistake, but they still do it because of untold reasons. Presumably, they have bigger goals and can sacrifice this leak of information to this species. But this is an important leak. It tells us that we *should* brainstorm about crazy solutions to this shivan menace, which would, in turn, create a landscape of solutions quite different in their
nature from the ones that gave us the Collossus. IOW, post-FS2 shows the downside of your "Shock and Awe" solution.