It is unsurprising that it varies by country, etc. Below is pure speculation while eating a snack:
Likely dishwashers for the NZ market are designed to actually spend sufficient time heating the water.
My impression from watching the TC videos a while ago is that at least in the US, (many) dishwashers probably only do a insufficient time interval of adding more heat to the water.
It makes sense that different markets developed different ways; the brands that optimize for the local trends (cold vs hot water) can skimp on some features and have lower costs.
Likely dishwashers for the NZ market are designed to actually spend sufficient time heating the water.
My impression from watching the TC videos a while ago is that at least in the US, (many) dishwashers probably only do a insufficient time interval of adding more heat to the water.
It makes sense that different markets developed different ways; the brands that optimize for the local trends (cold vs hot water) can skimp on some features and have lower costs.