Corpus Centralization
Centralization of the retrieval layer is distinct from centralization of storage, and conflating them is why consolidation programmes fail. Storage consolidation requires migration, political agreement and decommissioning. Retrieval centralization requires only that every source be readable and that one classification scheme be applied across them, leaving the source systems in place. The benefit is the same in the dimension that matters — one entitlement model, one taxonomy, one place to ask — without the cost that kills the alternative.
Centralpoint centralizes the governed layer while leaving the estate distributed. The practical test is whether a single question can draw on a structured record, the correspondence about it and the meeting where it was decided, under one entitlement statement — which is the arrangement harmonization produces and per-system search cannot.