Simply assuming that "every employer does it because theoretically it is easier for then to do so" to help your argument is rather self-serving, considering that labour unions are explicitly legal and exist.
You think you're thinking about reality.
All you're doing is imagining reality. You're living in a fantasy.
It’s news to me that what Adam Smith wrote about in that book was theoretical. Oh well.
Simply assuming that "every employer does it because theoretically it is easier for then to do so" to help your argument is rather self-serving, considering that labour unions are explicitly legal and exist.