Liberal democracies in other parts of destroyed europe also built lots of housing, with decent quality, in the same time period. But they didnt fix homelessness because they didnt want to, even if they actually could and should have.

I dont think they mass production and build quality (non soviet, europe housing from the same era is pretty similar in quality and also looks kinda cool) is really the important point here, its the underlaying ideolocal difference.

This might a good place to share a video how cool soviet era housing can be.