There are two sides to any relationship. An employer can choose to begin their relationship with me in a non-adversarial way, accepting that I and my colleagues

There are two sides to any relationship. An employer can choose to begin their relationship with me in a non-adversarial way, accepting that I and my colleagues want to be represented by a union of the group of us and still be decent and try to reward us for the hard work we do, or they can fight it tooth and nail, constantly stick to the "letter of the law" like Apple here (which is just trying to make union and non-union employees feel disconnected from each other and shed negative light on the union), etc. That's why unions also use these tactics to fight back against that (the old "work to rule" or whatever you want to call it). I expect my employer to treat me as an individual and as a member of a greater collective of humans. Besides, my employer isn't a faceless corporation, it's the management in the chain from my boss up through the CEO, all also humans. Instead, most employers choose to use what power they have over me to make my life harder and make my working time shittier for no reason. Unions didn't just pop out because people felt too comfortable and well-treated at their jobs.