There are definitely hotkeys that allow you to do anything via keyboard; your friend just didn't know them. If they had searched, they would have found the help

There are definitely hotkeys that allow you to do anything via keyboard; your friend just didn't know them. If they had searched, they would have found the help page https://support.apple.com/en-us/HT204434 https://support.apple.com/en-us/HT204434 "Mac accessibility shortcuts". For example, the global hotkey Control-F7 toggles the above-described "All controls" navigation setting, and Control-F2 switches focus to the menu.