It's because those things not only take more time, it's that the number of people who are really good at it are few and far between. That gives those employees leverage.

Employers are trying to turn all workers everywhere in every industry into completely fungible atomatons. This maximises the candidate pool and drives wages to a minimum. Employees who demand humane working conditions can be canned and replaced with someone more desperate.

In their ideal world we would basically bring back feudalism.