Short answer: It reduces stress because you have to worry about one less thing-money.
Answer:
A benefit of achieving financial well-being is that it can help make your life more stress-free (depending on your level of financial independence). Financial Independence removes stress because you have one less thing to worry about, which is the financial side of things. Now, it depends on how financially well you are. For example, if you have enough wealth to meet basic necessities, that at least removes the stress of not having enough food or a place to live in. It can also reduce stress in cases of emergencies or economic recessions because if you have enough money saved up, there is no need to worry. But the real power of financial well-being can be seen if you have enough wealth that you can retire and still live a comfortable life. This can automatically reduce your stress because you won't be bound to work for money. You can do what you truly love, that is to follow your passions. So, depending on your level of financial wellbeing, one benefit that comes is reducing the amount of stress you have.