So I'm curious emm
Non jokingly, which series do you think handled an UNDERSTANDING ending the best?
Space War One ended with a large number of Zentradi switching sides over to earth, but nowhere near all of them. Culture and understanding was used to gain a temporary military advantage in the final battle, but just enough of one to scatter their fleet and make them unlikely to return in the near future.
Then we timeskip a couple of years, and see the result. The Earth is still mostly fucked, but people are rebuilding and things are getting better. The Zentradi defectors are integrating into human society, but not seamlessly. Not all of them want to be here, the novelty of culture has worn off for others, and a dangerous few want to return to the way of life that they lived before. Winning the war didn't solve all of the problems, and a cultural victory isn't mind control that makes your former enemies perfectly docile.
Having the balls to have 8 more episodes after the war ends is what makes SDF great.