Deadlifting is a pseudoscientific measure of strength. It is mean to select people in artificial competitions using weights arranged or “constructed” in unnatural configurations of two heavy parts connected by a specific type and diameter of bar that you’d rarely find in the real world. People who really succeed in physical jobs in real life need to be able to deal with weights in all shapes, with handholds of varying types — or no handholds — and with surface textures and slipperinesses of various values.
In competition the deadlifted weight is only raised to waist height and returned straight down. In real life streetwise physical workers may need to place weights on truck beds located above their waists.
And real workers are not suckers who just use their hands and a piece of cloth to lift. They know that there are gloves, ropes, and other tools that make the difference between a competition lifter and a successful teamster. In fact, they know that they can get fat and soft and just use a forklift or backhoe with a cable attached to it and lift anything they need to lift, even while wearing Birkenstocks, and play golf in the free time they create using such mechanical assistance.