I had a rather specialized case where it was the pragmatic choice (note, not technically required): running a lottery with potentially litigious losers.

If you used a CSPRNG with a seed space smaller than the set of possible lottery outcomes, losers could argue (misleadingly, since we still couldn't feasibly bias the result) that not all outcomes were equally probable and try to get the results thrown out. That is, the fact that there are widespread misconceptions about /dev/random can very rarely be a reason to use it :P

However, I agree that the rule is that you should just use /dev/urandom.