We have plenty of entropy sources. The only situation where we have a problem with that is the so-called early-boot-time-entropy. However hardware RNGs don't so

We have plenty of entropy sources. The only situation where we have a problem with that is the so-called early-boot-time-entropy. However hardware RNGs don't solve that either, because, well, they need some kind of initialized OS to access the hardware in order to work.