Are manufacturer AC cables good enough?


I have two PS Audio AC3 and two Pangea AC 14 cables I don't use.  My thinking is that Ayre wouldn't supply cables that are inadequate for their components.  Is that thinking flawed?

db  
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I run a Lindemann, PMC, JL Audio system. Recently upgraded all my power cables to AQ and NRG. Was anticipating a big audio improvement. There was a slight improvement I believe when I switched back and forth between the stock and after market power cables. Not the "Massive improvement" toted by the cable manufacturers and testers of those products. Although there is a huge difference in the quality of the cables look and build. The NRG cable is truly a work of art so I am happy. 
Power cord must be:

1.UL rated
2.Originally supplied, or meeting same specs as original
3.Long enough to reach your units easily ie. no tension
4.Connected to a good quality surge protector (unless your stereo is a cheaper crap than the power cord itself ;) )

Did I miss something?...pls add
"subjective measurements "
??

this is an oxymoron term....

same as 'anti-aging' face cream....
If Ayre whose top line amplifier sells for around $35,000 tosses in junk power cords
What is the evidence that the OEM cord is "junk"? Also, which amp manufacturers include a $$$ power cord?
“No, different means different. Whenever two things are different one is of necessity better, the other worse.”
This statement is wrong. Vanilla and chocolate ice cream. Bordeaux and Burgundy wine. One is not “of necessity” better. They’re different. Difference does not necessitate superiority.
Different:adjective 1. not the same as another or each other; unlike in nature, form, or quality.
I have multiple systems that I’ve spent thirty years carefully assembling.  The components were chosen for synergy with each other and the room they’re in. Solid state rig. Tube rig. Streamer. They all sound great, but they also sound different.