[tbrownaw]

If you don't know what the PRNG (DRBG more appropriately) is for, you didn't watch the tech video.

Video is not suited for technical details.

It's not easy to quote / excerpt, to quickly refer back to previous (or later) parts, to take more time over parts that need it, etc; not the way text is.

My default reaction to "you'll understand if you just watch the video", is that someone is peddling bullshit and doesn't want me thinking too deeply.

[hinkley]

It's also a really convenient way to deflect when, and this is just a hypothetical here, you were wrong and jumped to conclusions.