Progressive/Liberal =/= Leftist come on man you know that. Liberal solutions always fall short. Pretending that Leftists should not engage with or address racial issues is a losing set because racism and classism is inherently tied (as I've discussed earlier). Also not even most Liberals believe all the stuff you just said they do and certainly not most Leftists.
How many "leftists", by this definition, are there in the United States, as compared to progressives? How wide-reaching are leftist platforms, compared to progressive platforms? How much influence do leftists exert over public discourse as compared to progressives? How clearly do the general public distinguish between "leftists" and progressives, and how clearly does this distinction impact their likelihood to support a given policy, candidate or political party?
Ordinary voters don't care about the fine gradations of online political identity, they just see that "the left" is advancing frivolous representational politics over substantive reforms, and they draw the understandable and often bluntly very accurate conclusion that "the left" doesn't have anything to offer them.
Just because we stop talking racism, doesn't mean they'll stop doing racism. In fact, I'd be sure its the opposite.
It's not
whether you talk about racism, it's
how. The current progressive commonsense is a framework of "white privilege" in which all white people experience tangible benefits from a racially unjust society and must be prepared to experience and equally tangible decline in the quality of their lives. This presentation of the relationship between racial groups as fundamentally antagonist is purest ambrosia to racists, because it affirms what they have been saying all along, that if things get better for black and brown people, they must inevitably get worse for white people, and that if things are to get better for white people, they should expect that things will get worse for black and brown people. Progressives may still be able to contend that white people have a moral obligation to accept this unhappy unreality, but when times are hard, these sorts of abstract moral obligations are the first thing that people jettison.
The very last thing that racists want you to talk about is class, because that completely disrupts this narrative of racial antagonism. An argument from class asserts that white people and black and brown people stand to gain the most when they work together; that improving the material condition of working class black and brown people goes hand-in-hand with improving the material conditions of working class white people. It threatens the central pillar of their entire political project.
The only people who believe this are those lamenting the impending "white genocide," and I wouldn't exactly describe those folks as progressives.
The prevailing perspective among progressives is that white people have to make conscious efforts to give up power and wealth in favour of black and brown people. This may sound fair and reasonable when contextualised within elite institutions, and in practice this is the intent, to argue for a more demographically-representative distribution of positions and resources within elite institutions. But to working class people, of
any race, this sounds sort of rhetoric sounds absolutely dystopian when applied to their own lives and communities. I don't think that progressives mean this to be so, but I think it occurs because many of them, and certainly those given the most visible platforms by the elite institutions in which they are situated, haven't given serious thought to how this reasoning applies outside of elite institutions, haven't given serious thought about what racial justice looks like for working class communities, and that is the fundamental problem.
A lot of leftists I'm aware of espouse intersectionality as default and recognise the complex intersection of race, class and gender in the resulting makeup of countries like the US.
What you're describing (zero-sum aside,
@Synsensa covered my reaction to that nicely) sounds a lot more liberal; the mainstreaming of progressive concepts (and thus either their dilution, or their simplification). So we go from "race is very important in the US in particular" to "race is the only thing that matters" (apparently).
"Intersectionality" is just a word, it doesn't represent commitment to any actual policies or programs. In practice, American progressives present race as the most fundamental organising logic of American society, and racial identity as the most important characteristic a person carries. They may not be committed to this framework in any particular enduring way: a few years, gender was often presented as equally or more fundamental than race. In both cases, class was placed in the background, and when it was acknowledged, it was in the flimsy framework of "classism", of prejudices about background and upbringing, rather than of class a material reality.