But I really think that those things were a result of the bits they didn't change. Anything they did change, watered down that theme.
One thing people point out as a probably unintended consequence of shoe-horning the different series together, is that it's implied they basically genocided/assimilated the Zentraedi because they're never seen again as a distinct culture after the two sides end the war. The entire zentraedi culture was basically exterminated and forced to serve under humans. Humans who had, overall, much less advanced technology and knowledge of space warfare.
Whereas in Macross, the Zentraedi fleet commander Breetai Kridanik was made the combined UN High Commander after the war according to official continuity. Robotech fans on one forum were quite aghast on hearing this: "An alien leading human troops? Preposterous". But thinking logically, who else but Breetai would have been more qualified to lead an interstellar space navy? Certainly nobody on the human side. Robotech supplants that worldview with the "humans kick alien butt then force them to be like us" plot development.
... yeah, this is where I'm finding it kinda' questionable you've actually done much robotech. Forget exactly when, but breetai ends up one of the major military commanders there, as well. Can't quite recall how major, though... it's definitely been a while since I last read through the books.
Though yeah, there's not much zentradi culture. That's because they basically didn't have one to
begin with -- that's actually the entire bloody reason they didn't straight wipe the floor with humanity. Even the SDF's ultimate effectiveness hinged on that. And with wozzname's post war go, much of what was left of their hardliners got wiped (along with another chunk of the earth's already mostly gone population). Zentradi expertise and whatnot definitely gets tapped from one end of the post-initial war material to the other, though, and particularly once the hybrids and the relationships that formed them started showing up. The importance and crap of non-humans expands
massively over the later material, too, especially in the novels with the later SDFs that start hopping around.
Robotech and macross are... very different, but robotech, particularly once it starts being able to work outside of kludging together macoss's material, does a legitimately pretty good job of coming into its own.