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We also need to understand that a subset of vi features is part of the POSIX standard, so any POSIX system will need to have "vi". vim is the logical choice there.

So as a result vim has become the reference implementation for the POSIX vi featureset.

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All of vi is specified by POSIX, but vi is only a subset of vim.

Right, but vim is a popular, easy-to-package implementation of vi.

Agreed and if you somehow really need strict POSIX compatibility than Vim’s compat settings make it behave almost 100% like traditional vi.

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