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I think the ETP80s do have an AC line filter and surge protector. It is the ETP60, which I have, that doesn't have the filter if I remember correctly. I'd suggest you not add filters in either a line conditioner or in the powercord unless you need it such as when you hear static, interferences or sibilance and such in your system.
Although power accessories, inline or outline, such as power conditioner, surge protector / suppressors, ferrites, choke, parallel filters do help cleaning the power that is fed to your equipment which do help them perform better; a good enough equipment will have a good enough power filteration circuit within their power supply, therefore, minimizing reaction when changing to a very good power cords. In theory, the better equipment it is, the less a good power cord will react it's performance.
For your discussion about whether if a power cord should have a inline device for filteration... My thinking is... a good power cord design should focus on how to prevent interferences instead of how to filter them. Good manufacturers who makes equipments should take care of the filter problem.
Power cord filters are required (by law) in some jusisdictions (Europe, as usual, is ahead of the USA) to prevent equipment from putting noise onto the power lines. This is the opposite to what audiophiles are worried about. Such a "filter" is properly called a "retlif" ("filter" spelled backwards".