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At least in vim, you can remap just about anything that you want to.

The reason the feature doesn't get included as often is because of exactly this. Even someone who could make use of the feature, and is annoyed by the current keybindings, doesn't take advantage of re-binding. The reason it is available on video games, on the other hand, is because its necessary for controller support, which a large enough portion of the video game community uses for it to have high demand.