What are the disadvantages of a fixed interest rate?

Can you please elaborate on the drawbacks of opting for a fixed interest rate? Are there any significant limitations or potential risks associated with this approach? For instance, how does it impact the borrower's flexibility in managing their finances, and could it lead to missed opportunities for savings if interest rates were to drop? Additionally, are there any penalties or restrictions involved if the borrower decides to terminate the loan early? Understanding these disadvantages is crucial for making an informed decision.