I’m not saying short runs of 1 or 0 is not suitable for cryptographic use. I’m saying we always strive to remove any non-uniformity. Ie. Output of good CSPRNG will not have runs of one or the other.

True hardware random generators regularly have runs or non-uniformity. That’s why we use them to seed a CSPRNG not use the output directly.

Example https://crypto.stackexchange.com/questions/38053/what-should...