In my opinion, what cord should go where, is more about finding the best synergy than about any particular formula. I say that power cords usually are component dependent. The sensitivity of a component to different power cords is variable in my experience. I have found some components to be rather sensitive to different power cords and some are more insensitive.
In my case, across three systems, systems one and two have the best cord on the amps and the other cords were selected for best synergy with each component. There are four or five different brands and/or tiers of the same brand and also some DIY cords in a couple of spots. The cords to the wall are of similar caliber to the majority of the other cords. System three does have the best cord at the wall to power conditioner connection just because that provided the best synergy.
So, I suggest simply experimenting with your cord and component combinations to find what sounds best. Buying some used cords of various brands and types may help to find good combinations. I have two different DACS that really woke up when the right cord was found for each one.
I do have friend who is a very process oriented and compartmental driven thinker that has the same power cord on everything from the wall to the amp. I guess it takes all kinds to make the world go around.