When I say 'necessary', I mean that the Goa'uld don't bring anything to the table that the other factions don't already possess, meaning that the other factions can view them as not important to an overall victory. Which is why they can feel comfortable not dealing with my faction, because I have nothing that they want. And I can't use the threat of punching them in the face because they don't believe that it's a credible threat.

Alright then, let me just check to make sure. So it's okay for me to go to another universe where sentient life never developed and colonize that to my hearts content, but I can't colonize a single planet in a universe that has other PC factions in it? Got it, makes sense. 

But hey, I can't explore other peoples home universes because unless they came through one of my terminals then I don't even know that they exist. Because again, none of the individual characters have felt interested in interacting with the Goa'uld. Which was a thing in the last RP too, so I'm not sure why I'm surprised. 

Basically, I can't fight because everyone is confident that they can kick my ass, I can't negotiate because no one wants to talk, they just want to enforce demands, I can't do sneaky stuff to change it because the various factions opposing mine are immune to the one area that my faction is specifically out and out good at, and my only hope for teching up is either robbing Tyranid battlefield graveyards (which seems like a bad idea just in principle) or going to another universe and getting it. Ignoring the fact that if it was that easy then the Goa'uld would have done it in the five years since arriving here and meeting the Imperium. 

But of course it's all my fault. Why should I be surprised?