Would it help to think of it as a (kernel) RNG daemon that you're trying to connect to, that doesn't finish starting up until it's seeded? That's basically what the blocking means, in the OpenBSD case.
Which is the correct behavior. `/dev/urandom` should really be the only source of randomness on Linux. Mac [0] got this right, FreeBSD [1] gets this right. I totally agree with sockpuppet. Solving the tabula rasa system boot is a separate issue. Temporarily blocking for seeding is fine, my shouldn't was an RFC shouldn't.
