Right, I know. This is a fundamental disagreement in how we see "the right economy" and the right type of structure for a country.
Honestly, I don't even really have a problem with what you're saying here. I think the answer to the problem you're describing is strong unions to be able to claw back the fruits of all those gains in productivity for the working class, pretty much by force, and then a democratic-enough government in place that it won't squash or undo that whole effort on behalf of capital. That's very different from anything we currently have.
I think that the US economy as it existed for white people between about 1940-1970 was a very clear example of how things can work well, and if we could deploy that, extended to all races instead of just the whites, and replacing oppression of the third world on a massive scale with technological improvements, I think that would be good.
One thing incredibly notable to me about that FDR economy that I like, is that it didn't come from some political class coming down from above and saying "here you go we fixed it" -- it only was able to happen because people banded together into unions and fought multiple generations' worth of literal bloody battle to demand the type of economy they deserved, and then after the fact the politicians took credit for having "given" it all to them. But whatever.
I don't really expect you to agree with me on that, but I don't have the type of intense disagreement with you if you're saying that Biden isn't putting us on track for real communism which is what's required. My real intense disagreements are reserved for other people who are pretending that Biden is doing a Clinton-style neoliberal betrayal of even my preferred within-the-capitalistic-model progress, and so even people who want that FDR economy should vote against him.