Economists definitely pay attention to more than U-3, and they're the ones coming up with the stimuluses and other proposals. Not everyone needs to be aware of

Economists definitely pay attention to more than U-3, and they're the ones coming up with the stimuluses and other proposals. Not everyone needs to be aware of TCP to be able to, e.g., use the Internet on their smart phone. Economists use a wide variety of different metrics to measure employment and set economic policies accordingly. Wage matters a lot too, not just unemployed/partially employed/fully employed.