> So you can just retire after being fired?

Not in my country (in Europe). You get unemployment benefits for 2+ years that is a percentage of your salary up to a certain level. The maximum you can get is around $40k USD, which can be difficult because you probably have a mortgage and other expenses that were calibrated to a much higher salary.

You are also required to actively apply for jobs, and you may be required to take a job application course. I think you can even be assigned to a job interview if you delay. It is not intended as a "free" paid vacation. I think that even in some cases you are theoretically required to take any job anywhere in the country even if you have to move, but I haven't heard of anyone who had to do that. I assume they look at your social situation (family etc.)

After 2 years you are placed into a different type of program where you don't get a fixed amount, but you get money according to what the local government decides you need. That means you would need to sell your big house and move to a cheaper appartement if you want to get any support. If you had any savings, you would probably have to spend them before getting any assistance.

Yes, but you don't tend to get fired on permanent contracts to begin with and it's much more enticing to find something new especially considering work-life balance is very very good, I work maybe 24 hours at most with my company explicitly putting your personal life before work because a healthy employee is a healthy employer. You also still pay taxes over the 50% income you're receiving and taxes are high, so it pushes you to find something new -eventually-.