I suspect the reasoning is thus:<p>Pi &amp; friends are all well and good when all you&#x27;re doing is filling out a few initial bitfield states in a pipeline, but when you&#x27;re designing a highly complicated process by which to deterministically produce a safe but &quot;random&quot; curve, the process of designing that process itself is going to have some unjustified choices in it. The meta-algorithm, if you like, could have been designed to produce a specific result given the input pi.<p>Publishing &amp; rigidly defining the method <i>before</i> choosing the seed would seem to alleviate all possibility of foul play.