your reviews are very detailed and covering almost all aspects of the device. however: the weak point of every notebook is the hinges between base part and display. on my daughter's computer the nuts from ALL screws fixing the hinges have come out from the plastics botom cover. it is very clear, that the plastics around those nuts is way to thin and weak. this is design-for-failure, but dell is refusing warranty insisting that it can only happen upon accident. in my opinion many will fail after so many open-close cycles. as alwas i recommend: never ever carry the computer around while the lid is open. this will drastically increase the stress on the hinges (but has never been said to be an invalid use case). fixing is very difficult, i'd say impossible.
hence: the quality and strength of the hinges should be part of your reviews. failure in that area renders the computer useless long before electronics or display are getting(//) old. this is not specific to one model, not even to dell. however, i have never seen a macbook suffering this. but they don't use plastics for the bottom part, so nuts pressed into aluminium cannot be compared with nuts in plastics. i won't by a notebook anymore, if not sure about durability of the hinges.