Without spending too much time wandering afield from your basic point regarding differences between German and U.S. benefits and application requirements, I think that it is relevant to some degree "who paid the unemployment taxes". Very briefly, here's why:
You are very right. Thanks for explaining too the differences in the payment modalities in Germany vis a vis the US.
And you find out that the answer is "not enough."
The system is set up so that couples with both partners working are generally ok. If one person loses their job, the other can at least buy groceries even if they have a pretty low income. Most large payments (house and car) can be deferred for several months before things come crashing down. I lived next door to someone who made no mortgage payments for two years--the bank put up with it because their other choice was to foreclose and end up with a house to dispose of.