automotive workers unions started around 1918 and became major political players in the 30s -- a fact that i'm sure is wholly unrelated to why there are so many un-automated tasks in that industry.
It’s not really a secret that most new auto factories serving the US tend to open in places where those unions are not active, like the South or Mexico
Pretty different tasks, environments, outcomes, metrics, goals, and other things in a warehouse vs. a factory… really have no clue how this is supposed to be relevant. Why not mention farms or libraries?
Libraries are typically either governed by a municipality's rules around employment and treatment of employees, or part of a school/etc where there are again additional guidelines about these things to be sensible and not leading people into unsafe behavior.