> The question is, do you find it convenient that you can be fired for reasons which have nothing to do with your job?
We can't separate this from being fireable for being bad at your job, or for making others hate going into work because you're insufferable or a sexual harasser or just undesirable to work with.
> How do you feel about not being paid because your boss wants to hire a poorly qualified relative instead?
Perfectly fine. It's his money. If he wants to spend it unwisely, he's welcome to. And I'm not "not being paid." I'm "working for somebody else."
> Or not being paid because you refuse to work on weekends?
That's not the matter under discussion. You can already sue over not getting paid, or you can work somewhere else if they want the deal changed.
> What essential freedoms are taken away from private Swedish companies or from employees in Swedish companies?
The freedom to agree, "You'll pay me money to work for you and either of us can terminate this agreement at any time."
The ability to freely partake in economic activity is essential.
> How has this had detrimental effects on the Swedish economy or lifestyle?
See the inability of immigrants to integrate into the Swedish economy and Swedish society.