I am sometimes amazed how complicated UI can someone create with e.g. four arrows and two extra buttons.
Like, I would naively assume that the arrows would move your selection up, down, left, right, and one of the extra buttons would be "select/confirm" and the other would be "escape". But no, that would be too easy. Depending on exact position in the menu, sometimes the right arrow, sometimes the first extra button, and sometimes the second extra button selects the highlighted thing. Sometimes up and down arrows increase the selected thing (e.g. volume, brightness) and you need to press one of the extra buttons to stop doing it. Sometimes one of those extra buttons acts as a hotkey that will switch you to a completely different menu, so it will take five minutes to navigate back.
Then sometimes a confirmation windows opens, with two buttons "yes" and "no", one of them is pink and another is light blue, if you press any of the four arrows, the colors switch, and you are free to make your guess whether pressing the extra button will confirm the pink option, confirm the light blue option, take you to a completely different place, or turn off the menu.