Trades like plumbing, electrical work, and auto repair require physical presence and cannot be shipped to a distant workforce or automated away, giving them a durability that many information-economy jobs lack. The stuff being worked on asserts its own reality, which protects the worker from the shifting ground of abstract knowledge work.
Working with physical things subjects the worker to standards that are external and non-negotiable: the engine either runs or it does not, the joint either holds or it leaks. This confrontation with objective failure, rather than social or subjective judgment, is what grounds genuine self-respect and competence.
Scientific management split the planning of work from its execution, concentrating knowledge in managers and stripping it from workers on the floor. This same logic migrated into white-collar settings, so that even cognitive labor can be routinized and dumbed down, removing the worker's grasp of the whole.
The manual worker can point to a finished object and say plainly whether the work succeeded, while much office work produces outputs whose value is ambiguous and dependent on others' perception. This difference reframes meaningless-feeling jobs not as personal failings but as structural features of labor severed from material results.
Diagnosing a broken machine demands that you attend closely to how it actually behaves rather than to how you wish or assume it works, training a habit of submitting the mind to reality. This attentiveness is a cognitive and ethical virtue, a form of humility imposed by things that do not care about your intentions.