Probably because in a preexisting capitalist society if you're just picking and choosing the industries to take control of, you're stilling working within a capitalist system. Until you're willing to dictate production and remove large amounts of private enterprise, you're just adjusting the guardrails.
Bernie and AOC themselves claim they are Democratic Socialists, so ask them why they include Democratic if they're just Socialists. They're careful to preface their response to the question with that clarification—likely due to concerns of political ramifications. Even considering that, they're still not going all in on Socialism, and most of the claims that they are Socialists seem to come with the caveat that they want to destroy Capitalism in their heart of hearts, but there's no real evidence of that. They're most Socialist policy is M4A, which is an established norm in 3 dozen capitalist societies. It's socialist in nature, sure, but it's not some deathblow to the very concept of capitalism.
As for the issue of race, luckily nobody is advocating just dumping a billion dollars into black communities. What I'm referring to is seeing the connections between Poverty, Healthcare, Childcare, Criminal Justice Reform, Discrimination, Education, Police Brutality, Modern Segregation and how they all tie into Race. Simply improving economic conditions is not going to solve racial inequality—by your own admission, dumping money into these communities isn't going to fix the problem.
Warren is a lot more open about these connections and how her policies interlock and include specific pieces that benefit disadvantaged communities, and had a lot of these plans out there when she launched her campaign. Whenever she gives speeches she gives long detailed history lessons on racial discrimination and how it goes into all of these problems—her Atlanta Speech is probably the gold standard for outreach to communities of color imo, and perfectly exemplifies this strategy of hers.