I dont know this, and never claimed for this…. You seem to refute to answer my question
I think the reality is that power outlets must be built to a very specific standard to get a UL listing that is applied to them. Kind of like how 'certified' HDMI cables must meet a minimum standard. I'm not sure what that standard is, but I expect it is enough to meet and pass the power that the outlet and the subsequent cord is actually rated for as a minimum. That's the whole point of UL certifications I expect... Isn't it?
Assuming that to be the case, then the bigger potential issue is wear and tear, which is far more likely at the receptacle, then on the cord itself. Replacing your standard outlets with medical grade outlets, that have more gripping power, isn't a bad way to go, but it won't improve the connection I expect, just make it more durable and perhaps grip harder. But, the same amperage will flow from the outlet through the cord whether it's a 50 cent outlet or a 3 dollar outlet, or a free power cord, or a 500 dollar power cord.
I expect most of this is measurable, but it needs to be measured to the requirements of the device, not so much the fact that a better cord could handle more power. I'm sure it can. But, if it doesn't need more power, then it is irrelevant.