Surely a compelling reason for council amalgamation is to end the entrenched tribalism characterising the political relationship between Napier and Hastings.
It's an albatross around Hawke's Bay's neck, unique to this region.
New Zealand's regional communities are geologically defined, usually enveloped within landward mountains and coast, with an historic population centre clustered around a port. But here the population centre is evenly divided between two towns, close enough to be largely one association, but separately governed. This has always been an irresistible temptation for populist parochialism.
Way back In 1897 there was a proposal to have meat slaughtered for local consumption in a centralised abattoir, with a saving of costs such as meat inspection. Hastings proposed the established plant at Tomoana, but Napier objected. This letter from "Try Fluke" in the Daily Telegraph, written 118 years ago, I quote as it exactly encapsulates the "concede nothing, be prepared to duplicate everything" posture that has characterised the twin-city governance ever since.
"Sir, Why is it necessary for the Napier Borough Council to amalgamate, with the Hastings Council on this question? If it is, does not Dr Linney know himself as rather one sided, by proposing Nelson Bros at Tomoana as the place for the abattoirs?