Just pick one today, 10/21/2020. Lot number 2029, to replace my lot 1938, the issue on my old one, of course, was the notorious joystick drift and RB bumper that would work when it felt like, even when I hardwired it in. Anyways after reading your question and you answering yourself, I agree with you 100%, this is an issue that needs to be addressed and MS should for old version either do a free replacement or repair.
And yes my new one is still a FST-00001.
I’ve yet to test this new controller, but I hope it does not repeat. This is truly sad cause I do have the Series X on order and I can only hope this issue on the elite don’t carry over on console.
I guess for now, one can hope and continuing to keep it under warranty just in case of failures.