Tim,
IMHO another reason of controversy is because "natural" and "artificial" are essentially recording attributes, not equipment or system attributes. Equipment should reproduce what is encoded in the recording, not transform it. Unless we consider the whole chain: artist - sound engineer or related - system/room - listener , we will be always arguing over our momentary personnel preferences.
Maybe in theory you are correct but in practice this is truly not the case. Clearly the recording holds a large portion of what might be perceived as natural or artificial. It takes very little to degrade what "naturalness" is there, IME. What the equipment should or should not do is not really the point here...it is what the equipment DOES to manipulate the sound. As I mentioned, you can have a system that reports rather honestly the differentiation betweeen recordings, allowing one to hear all the glory of one recording while hearing clearly the flaws in another without rendering the flawed one unlistenable. If a system is making a high percentage of ones recordings distasteful to listen to then either A) You have TERRIBLE taste in music/recordings and what you select to listen to would only sound ok on a very low rez system or B) Your system is editorializing the sound in some way to exaggerate flaws in the recording to such a level that it becomes unpleasant.