It's been over a decade since I looked at this, but in real-time Monte Carlo path tracing the speed of your RNG is material. In simple enough scenes, probably something like 5-10% IIRC when using MT.
I appreciate that you had a note about performance, but you were pretty quick to dismiss that there's a large quality difference between rand() and any modern PRNG. Plenty of these are fine enough and paying for a CSPRNG with 4x or more the perf hit may be a mistake.
I do agree that if you don't know what you're going to use them for or don't know if you have a performance problem that you should just use a CSPRNG. The potential for someone to accidentally cause a security bug is not worth it. If they decide to do so intentionally, that's on them.
tl;dr: maybe "Need a PRNG? Start with one that's cryptographically secure"?
I appreciate that you had a note about performance, but you were pretty quick to dismiss that there's a large quality difference between rand() and any modern PRNG. Plenty of these are fine enough and paying for a CSPRNG with 4x or more the perf hit may be a mistake.
I do agree that if you don't know what you're going to use them for or don't know if you have a performance problem that you should just use a CSPRNG. The potential for someone to accidentally cause a security bug is not worth it. If they decide to do so intentionally, that's on them.
tl;dr: maybe "Need a PRNG? Start with one that's cryptographically secure"?