Think of the job of digging a swimming pool sized hole. With bare hands it would take a ludicrous amount of work. With shovels and wheelbarrows it still takes

Think of the job of digging a swimming pool sized hole. With bare hands it would take a ludicrous amount of work. With shovels and wheelbarrows it still takes lots of labor. With heavy equipment it takes (I'm guessing) a few people a few days. The shovel removed 90% of those jobs and heavy machinery removed 90% again. That does not however mean there are fewer jobs. It could mean instead that we dig more holes.