The flow from those pumps is abysmal - it is less than 0.9 liter per minute. While this is also usually 'adequate' to provide 'adequate' cooling for these coolers, it isn't really ideal or optimal, but I suppose it is 'good enough' to say you own a liquid cooler. Given that CPU TDPs have dropped quite a bit over the last couple years, this does help. Even the very lowest end DDC used in the EK Predator and Swiftech H220/240's runs at just under 0.4 gallon per minute, by comparison...a 6 watt product.
Copper is just less than 2x more thermally conductive than aluminum, so I'd say that is a decent margin, even though that doubling isn't a large value of watt-meters per degree kelvin. However, it is still a value of consideration and is why good watercooling radiators are brass and copper in design.
AIO's aren't going away, I understand this. I just want the education to exist so that users do not expect full loop cooling out of a boxed AIO. A car is a car, but there is also much difference between a Kia Spectra and a Mercedes G class.