Revell provided the name and the Macross models, but it didn't decide to tie Southern Cross and Mospeada into it. Remember, Revell sold models from Macross, but not Southern Cross and Mospeada models.
Is it an impressive feat? Not as much compared to the people who actually wrote and voiced the anime in the first place. And, by the way, animated it. At a breakneck pace. And, as you pointed out, there were many companies that were writing and dubbing daily animated series--and animating them too--before and after Robotech.
People forget that non-Robotech Macross was being released in English before Robotech, while Robotech was in the air, and after Robotech. Robotech brought in many, many fans on its own, but's let not oversell it by saying something wouldn't exist without it.
Saying that Macrossworld wouldn't exist if Robotech didn't put Macross on television in the 1980s is like saying: too bad there are no English Gundam websites now, because Gundam wasn't put on American television in the 1980s.