Samsung is an example of a manufacturer that doesn't make it easy. Oppo, One Plus and Google (LG) all have very easy to unlock bootloaders that have "official" instructions from the manufacturer (and it's two commands away).
Can you still brick it? Yes. Is it likely if you type the two commands as you're told to on the website? No.
Can you still brick it? Yes. Is it likely if you type the two commands as you're told to on the website? No.