Accounting practices reflect exactly what is relevant to profits within the desired time frame. There are no laws that make employee seniority valuable within the business cycle, so it has no value to account for.

The investment that business sees is like you spending a thousand dollars a year for a century in order to make a million dollars. Sure it’s a 10 to 1 return on investment, but you’ll be dead, so is it really worth it?

Oh jobs are replaced by machines, it just has almost nothing to do with minimum wage. Machines cost pennies on the dollar for production value compared to humans. The human wage is pretty meaningless at that point, even forced labor is less profitable.