Instead companies talk about how much they can afford to pay for salaries. Frequently they talk about increasing the cost of employees from the point of view of expanding. Should we hire more people? Will it improve the business? Should we increase salaries? Will it allow us to attract better employees?
When companies are talking about reducing or restricting the cost of employees, it's usually in the context of solving problems in the company. The company is losing in money in some areas. Should we lay off employees? Can we negotiate a pay freeze or a pay cut until the company can get in better shape? Will we lose too many employees if we do that? Will we lose our best employees if we do that?
The biggest problem I have with unions (being one of the few programmers who has actually worked as a programmer in a union) is that in my experience is the conversations almost never discuss the health of the company. They only discuss strategies for maximizing pay, benefits or ensuring that layoffs are impossible.
I honestly believe that the attitude of "They are doing it so we have to too!" is a thing that destroys companies. The Us vs. Them approach helps nobody. Yes, if you have no choice and the company you are working for has decided that they want "Us vs. Them" and you can't convince them to join you in making the company and it's employees successful, I can completely see the point of a union. For me, that's a last resort. I'll try everything I can to fix the problem a different way before I'll say, "We're going to organise so that we can effectively compete with you". This includes simply quitting my job and finding another one.
Or to be more clear: I greatly value working at a company where I wouldn't ever think of organising a union. I value working at a company where the company values me and sees it as a cooperative venture. I don't want to work for a company that views me as an adversary or as someone they need to manipulate. That's why I don't want a union. In my fairly long career I've worked for both kinds of companies, so I know both exist.