I don't think I have that misunderstanding. My question is, do you have proof that:

1. the CSPRNG in Linux is secure, and

2. CSPRNGs in general exists ?

Fixing #1 simply requires changing to another algorithm.

Fixing #2 requires a secure RNG to block for entropy, and if the distinction between /dev/random and /dev/urandom goes away, then this scenario will cause problems _if_ it happens. I said it's very unlikely, but I don't think I should get this uncharitable response by pointing out the issue.