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.
Hyundai’s manufacturing facilities in the U.S. are not unionized.
Amazon warehouses still have a huge number of ununionized workers doing manual labor
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