My understanding is that the way cryptography is done is by having hardware entropy source in the CPU fed into some sort of hashing algorithm. Having a CSPRNG w

My understanding is that the way cryptography is done is by having hardware entropy source in the CPU fed into some sort of hashing algorithm. Having a CSPRNG with only n bits of initial entropy either exposes the problem of if an attacker can somehow get the state of the CSPRNG, then they can predict future random numbers that are generated (and previous ones, depending on implementation). Constantly reseeding with entropy means that it's not possible to do that.