Just to be clear about warnings...
This isn’t so much a question. I think this training is good, but the last minute of this lesson can easily be misinterpreted by a lot of people.
I believe Anwar is saying the Photon design system discourages illustrations for warnings. The way the video plays one could easily forget he was referring to Photon and then think no warning illustrations should ever be in any design system.
There are plenty of examples of warning illustrations that are extremely effective and aren’t lighthearted at all.