You're asking for added features to change how the game is meant to be experienced, and it simply was not in the vision for the game.
For example, let's look at Pac Man. When beating Pac Man, should the devs provide the player the ability to despawn ghosts, or make 100 ghosts, or make Pac Man invincible, or make all the dots into power pellets, or have fruit appear every second, or be provided a map editor to make their own maze? Because the game doesn't have these things, does that somehow mean the devs are looking over the player's shoulders telling them they're playing wrong or tying their hands?
Cheat codes can inadvertently burnout players by experiencing all the content really fast in a matter that wasn't intended. Even as end-game unlockable content, this can remove any need to replay a game, and replayability is a foundational pillar of EVERSPACE. Sometimes having a sandbox mode or unlockable can be a good thing, but not always. Skyrim obviously doe...
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