SettingWithCopyWarning heuristic detection across pandas copy-on-write mode

Organizations building alert policies for chained assignment in pandas confront SettingWithCopyWarning's heuristic detection. The warning fires on patterns such as df[df.a > 0]['b'] = x regardless of whether the original DataFrame is modified, and pd.options.mode.chained_assignment offers 'warn', 'raise', or None but 'raise' relies on the same imperfect detection.

The copy-on-write mode, default-on in pandas 3.x, further shifts which patterns trigger the warning across version series, with no documented switch to enforce strict accuracy. This creates a policy uncertainty: how to version-configure alerts that catch genuine silent-failure bugs without generating noise from benign chained patterns?

What trade-offs should teams accept between early bug detection and warning noise when no strict accuracy switch exists? Can a version-pinned configuration reliably distinguish true copy-on-write bugs from false positives? How should alert policies adapt when pandas releases change chained-assignment semantics?