And I expect my car to provide a reliable form of transportation, but if I turn the key in the morning and chickens fly out from under the hood, I stop what I'm doing, I don't keep driving to work.
Agreed. Maybe the default in LibreSSL should be swapped from "go ahead and use this fallback faux-entropy if we have to" to "fail if we can't get good entropy". It'd be a matter of changing and undef to a def in the code.