That’s not a good counterexample if that is what you attempted, for 2 reasons:
- An index is redundant information but dropping it and recreating it is not “repairability” as in “I read and amend a text”. You compare apples to oranges.
- What I wrote still applies to an index, so that’s orthogonal: a binary index will be more efficient but harder to repair than a text-based binary index.