Forgive me if this is an overly-simplistic question – I'm a student, so there is a lot I don't know and this seems to be a complex topic, but I ask this in good faith: if the people that are members of the union are happy with it, what negative outcome is produced so as to make the union a bad solution?

From what I understand, the basic purpose of a union is to give its members more collective negotiating power with the employer. Its purpose isn't to better serve the company, necessarily, but to give the employees a more effective means of having their needs met – if employees feel these needs aren't being met, negotiating and making an agreement collectively could be a more effective route. Its job is to change the power dynamic between employees and companies, in favor of the employees. If this is the case, and the NYTimes tech staff who are union members like the outcome unionizing has had, then how is it a bad solution? What would be a better alternative of meeting the employees' needs?

I recognize my understanding is probably incomplete; I write this comment not to defend this position on unions, but to learn why it may be wrong.