Equally necessary doesn’t mean equally valuable. So there is that.
The more tasks that are automated, the more easily a low level worker is replaced. And the less they will get paid.
Think warehouses, checkout attendants, gig workers, …
The masses of jobs don’t require unique humans. And the more is automated, the less individual worker skills matter. For most jobs.
This gives businesses huge economic leverage over their workers. They will pay them the minimum it takes, and since this is an economy wide problem, every drop in wages somewhere makes it easier for wages to be dropped elsewhere while still retaining workers.
Finally, any area where many workers manage to hold onto higher wages will have a target painted on it as a prime place for new business value to be made finding a way to commoditize their work with automation.
Businesses are rapidly growing the capabilities of their physical and informational automation. Human workers are not getting stronger, faster, or smarter. So they are forced to compete for jobs by getting cheaper.