Despite Greenwood's definition of the mimic giving them the power to take any shape, mimics are almost always enemies in games largely because of technology. D&D players have the luxury of interacting with as many NPCs as they can imagine, but for early PC games like Ultima, creativity was measured in bytes. With an Apple II’s specs, there was barely enough room for a fantasy world, let alone rich dialogue. So, to meet gameplay needs, ‘the mimic’ was colloquialized to ‘the monster chest.’
But while Baldur’s Gate didn’t have an easy time cramming an isometric RPG into a disc, its mimics were a result of design philosophy more so than technical limitations. Again, the focus here was on exploring a world, and to that end mimics were most useful as a clever way to liven up dungeons. And really, aside from the whole eating people thing, that’s what mimics have always been about: meeting the unique needs of games.
By viewing the fundamental idea of ‘player expects loot, gets a fight instead’ through the lens of random encounters, they created the ‘box of enemies.’ The chest itself isn’t even a monster anymore, just a trigger for a random encounter. Does that make it a mimic? No, but it’s still a different means to the same end, and it’s still hardware dictating design. Random encounters were instituted to free up memory, after all.
