Geoffkait, doesn't matter, both are the same futile activity, horridly nebulous and fraught with subjectivity. Split them, merge them, either way they are useless. I'm a cable proponent, but that's different in that when I swap a cable I'm hearing the change immediately. What's being discussed that I find impossible is the notion that humans can accurately hear changes to gear over hours, days, weeks, months, etc. The belief in that is predicated up on the arrogant concept that humans have more consistent perception of what we hear than equipment has consistency in playing it back. That's laughable.
I showed that the entire affair, including the concept of component burn in as well as purported benefit to warm up, is a waste of time and energy. The moderators here have a problem with me pointing to my writing, as though I'm somehow benefitting from it (even though I'm not paid), so they will pull a direct reference to it or I would post it. You'll have to do a search for my name and the phrase "burn in". Having actually conducted comparisons and finding no difference sonically between both new/old and warm/cold systems at the same time, I have little regard for promotion of either one; they are summarily a waste of one's time.
Feel free to disagree, but I'm not interested in extended discussion of it here. I wrote my discovery and conclusions for all to read.