one of the other golden rules of indie game marketing is "give press an easy way to reach the interesting parts of your game." for example, SNAKE FARM has a secret cheat code that lets you unlock all packs instantly rather than unlocking them via achievements. sure, it might not be the precise play experience you want people to have, but streamers only have so many hours to devote to your project; make them count as much as possible
This is great for event judges, too! In IGF, being able to provide judges a way to see different parts of your game's intended experience is a way to make sure more judges actually experience what you're expecting them to experience.
forget the press, cheat codes are good. if i'm playing a game for the seventh time maybe i would like to skip ahead a bit
in fact i think cheat codes are one of the subtle things that have contributed to doom's longevity (anytime-saving being another). game too hard? cheat. want to spice it up? cheat. get yourself stuck? cheat. third-party level is just plain broken? cheat. working on a map? cheat. there's this fuzzy overlap with "coarse-grained debug tool actually" that turns out to be very useful