Totally agree. Smart Meters in NZ are half-arsed at best.
In the UK (and I think it's legally mandated, although I could be wrong) the smart meter comes with a little wireless display that gives real time consumption information so you can literally walk around the house flipping switches and see what happens.
That plus an API so you could set up Home Assistant or whatever to automatically kill the Spa Pool/hot water tank/freezer for a couple of hours when the price spikes would be pretty cool.
The only real advantage is the end of those bill shock horror stories you used to hear when the power company had someone on "estimated readings" for months on end.
The bigger smart meters (provided by the likes of Genesis) do have the functionality of reviewing data in real time (and have more smarts) - you might be able to set something up with HA if you have a retailer that charges when the price spikes by plugging in some other library for that? Never used such a retailer myself but I'm assuming ones that charge this way have a way of letting consumers know?