Try not to let humans do what machines could do instead. As a rule of thumb, automating a common task is worth at least ten times the effort a developer would spend doing that task manually one time. For very frequent or very complex tasks, that ratio could easily go up to twenty or even higher.
— Karl Fogel, Producing Open Source Software
See also XKCD: https://xkcd.com/1205/
I’ve come up with my own variant on this about a year or so ago:
Let machines do the boring, repetitive work. Human beings should understand how and why.