And for ships from Takamanohara with WARP cruising speeds of only 5 to 10, the travel time is even longer. Their colonies are scattered throughout the entire Orion constellation. Even if they have the potential to wage a protracted war, there's no way they could mobilize repeatedly in time.
So in the last war, when the Safety Committee's combined fleet launched a surprise attack, destroying their three main Titan fleets guarding the solar system, Takamanohara just conceded defeat.
But now, hmm, twenty years have passed, I think their fleets have almost been rebuilt.
And you guys, heh, fighting so fiercely over a cup, you've worn down half of your own fleets, and the Spice War has just begun; it won't be over anytime soon.