Man, every time i read posts like this -- and there seem to be altogether too many of them, given that Tesla's been building the same model car for more than 4 years -- I thank my lucky stars! My lowly 70D had no defects that I noticed on delivery, and I have only had 2 or 3 very trivial problems pop up in the 18 months since then, all easily corrected.
Either mine was built on the correct day of the week, or I am missing stuff that other people notice, or maybe I was just lucky! Or possibly there really are not that many delivery problems, but we hear about most of them, giving the impression of high rates of QC failures. Hard to know which is the case....