Sorry, but I really don't see how anyone can talk when you refuse to ever admit that you too have feelings that shape the discussion in question itself. I suggest you shrug off the flaky academic hypocritical charade and just lay your cards on the table (but then, you more or less have by, as I've said, posting other threads where you clearly favour the present perfect over past simple, whenever there appears to be a choice). And you're not exactly the most helpful person yourself:If you can answer it without going into the rights and wrong of it - and, yes, I have feelings about the form myself, but they have, at this moment, nothing to do with the question posed - then we can talk.
http://forums.eslcafe.com/teacher/viewt ... 4288#14288
My amazing memory also enabled me to recall this:
http://forums.eslcafe.com/teacher/viewt ... 9443#29443
I suppose that even if loads of Americans actually prefer present perfect or can't give you a straight answer you'll still have a bee in your bonnet about us all not switching to that (awful) American English, but then will start bemoaning the linguistic imperialism of the change or something. (Tip: If the flak gets a bit too much you could shrug it all off by claiming to have actually been arguing for linguistic diversity).
Apologies if your continual denigration(s) of AE were tongue in cheek, but a serious linguist would probably avoid making any such wisecracks at all, no?