Hi Reinhard, Welcome to the forum! While I think your point is valid for power amps delivering hundreds or in some cases even thousands of Watts, I am not sure how relevant it is to source components which is what we are talking about here.
The peak power consumption of the Rossini is specified as 28W (0.25A @110V) and it is shipped with a T2A fuse (slow blow chosen presumably to deal with the inrush current of the transformers). So even if the instantaneous current draw exceeds 2A, I still argue that a 14 AWG power cable (20A) is generously overspecified.
This was in answer to @glevethan’s question whether it was safe to drop from 11 AWG to 14 AWG for the Rossini and I still maintain the answer is “yes”, do you disagree?
Here I agree with you, even I would try it out with my ears, because I have had so many cases which technically sounded impossible, but still brought changes I could hear. If you would have asked me few years ago if USB cable can "sound " different, I would have laughed at you. Nowadays I surprise friends with a little supercap in the ethernet hub PSU, even its galvanic separated before and after. Hifi/ Highend is always full of new surprises.
You’re quite right Pete, T1A it is, my mistake. But the point remains, this is 4x the expected peak current draw of the unit at 110V and a 14 AWG cable is rated at 79x that expected peak draw.