The reason that is, is because the idea of bringing back "manufacturing" implies that it'll bring back the jobs as well. That bringing back "manufacturing" means all those people who lost their assembly line jobs will get it back, and things will go back to how they were. That's the reason it keeps getting evoked.

So the other line has to keep being stated, because it needs to be known that bringing back "manufacturing" isn't going to solve the employment problem for those people, and more needs to be done.

(I kept putting manufacturing in quotes, because those that tend to talk about bringing it back generally downplay the fact that manufacturing output in the US is at an all time high.)