I kind of halfway agree with the OP, I just wouldn't consider it a flaw of capitalism.
From a capitalist point of view, blue collar jobs lost in the US to outsourcing and automation deserved to be lost. The market optimized for a better solution for consumers, and that solution was cheaper labor and automation.
A true pro-capitalist party would admit that, rather than pander to coal miners and steel workers, and would try to make the US more competitive in the modern, global marketplace rather than try to drag the entire world back into the tar pit of American industrial dominance.
A true pro-capitalist party would even embrace socialist programs like nationalized healthcare and education, if that would make it easier for displaced workers to re-educate themselves and re-enter the workplace, and compete more readily with labor throughout the world, and take the burden of healthcare off of employers. Invest in infrastructure and technology. There's probably even a capitalist argument for basic income allowing the repeal of the minimum wage.
But "write as big a check as necessary and party like it's 1949" is just pandering, it's not even a serious attempt at a solution for anything.