Usability > grammar
Yes, `CLI interface` is technically wrong, but `CLI` or ´command-line interface` are substantially harder to read/understand.
Same reason we say PIN number instead of just PIN.
@juliank I disagree with your generalization. "command-line interface" is not harder to understand than "CLI interface", in my opinion.
My experience: In most cases, abbreviations make a text harder to understand. Exception may be when the abbreviation is more common to the individual reader than the long form.
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