I think it's generally agreed that the Xindi arc was an exciting and innovative part of Star Trek Enterprise, but the way it kicks off involves a certain amount of fridge logic. If the Xindi hadn't sent the small test model of their doomsday weapon, Earth would have had no idea that the Xindi wanted to kill them, let alone who and where their enemy was. Surely the Xindi should have conducted all tests in their own territory, and only sent the final, sure-fire weapon to Earth.
The real life explanation is Berman and Braga's tendency to end seasons on big cliffhangers without giving a thought to how the story would resolve (Space Nazis!). But what is the in-universe reason?
I recall someone saying that the probe malfunctioned, but I don't know where exactly that was said.... Even if this was true, what was the probe supposed to achieve in the scheme of things?
The real life explanation is Berman and Braga's tendency to end seasons on big cliffhangers without giving a thought to how the story would resolve (Space Nazis!). But what is the in-universe reason?
I recall someone saying that the probe malfunctioned, but I don't know where exactly that was said.... Even if this was true, what was the probe supposed to achieve in the scheme of things?