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I first learned about this from a recent (and excellent) Practical Engineering video [1] on the shape of cooling towers.

[1] https://www.youtube.com/watch?v=tmbZVmXyOXM

In theory, wet bulb should be used by weather reports on hot days, but for some reason it's not. IIRC it's hard to measure or to universalize - that is, it's hard to produce a consistent, meaningful, clear metric.

The "feels like" temperature weather reports use is an approximation of wet bulb.

Yes. My point is that there isn't a consistent, reliable method to define, measure, and communicate that. And without such a method, authorities like the CDC can't make recommendations that may affect life and health.

For a surprising application of this chart, check out Indirect-Direct evaporative cooling.

More cooling but (paradoxically) lower water consumption.

Summary: https://www.youtube.com/watch?v=sJl-NIgGDL8#t=89

Long-form (chart @29:30): https://www.youtube.com/watch?v=aVgB557bz0I

Not many people have wet-bulb setups.