Revert "[ENH] simplify logic for when to persist index changes"

[codetheweb]

Reverts #2539. Appears that this introduced a bug that can occur after client restart. Will add a (currently) failing test and fix in next PR.

[github-actions]

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Testing, Bugs, Errors, Logs, Documentation

• Can you think of any use case in which the code does not behave as intended? Have they been tested?
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• If appropriate, are there adequate property based tests?
• If appropriate, are there adequate unit tests?
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