NAD uses small power supplies, that is their “virtue”. Show me an amp with high dynamic range and I’ll show you an amp with an undersized power supply.

High current means it has a good power supply and sufficient output devices to provide it. It doesn’t really mean much unless they tell you the load impedance.

I remember a review a long time ago where a 45W Pioneer receiver put out the same 12.5A as a 50W Mark Levinson separate amp that was touted for it’s current output ;)
https://www.worldradiohistory.com/Archive-All-Audio/Archive-HiFI-Stereo/80s/HiFi-Stereo-Review-1987-01.pdf