I can see the apologist for Stalinism but I think your point about "utopianism" is not so much missing the mark as overshooting it by 8 miles and blowing up a red cross ambulance.
As for grounding it in concrete analysis. Well I'd say his 1500 page book that constantly refers to the culture of it's day, noting the prevalence of sub cultures, fashion, advertising, music and dance is pretty concrete.
Blochs very point was the need to understand "ideology" not just in political texts or in the media but rather in things like shop display, day dreams, sports and clothes, and not to merely dismiss them as "mystifications" but to eek out the "utopian" surplus that can ground a critique. This to me seems the embodiment of "concreteness", and also doesn't revert back to the bullshit binary of "appearance" and "essence".






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maybe because he was an apologist for stalin, a dire uptopian , and never really attempted to ground his critique any form of concrete analysis?
That's not to say he too wasn't an interesting character, with some interesting things to say, but no better or worse than marcuse who we could easily dismiss if we wanted too as a hypocrite for his involement with the US government propaganda machine & state agency that went on to become the CIA?