Aluminum isn't exactly a precious material. Its a light metal that doesn't corrode easily are its main benefits.
You don't exactly have to be a physicist to see the flaws in consumer reports testing. While a good reference its not a good example of how something bends in your pocket. The roundness of the HTC's back will obviously add some rigidity too it and CRs test immediately compromises that by applying a very narrow point of pressure which is very unlike what would happen in your pockets. This is further illustrated when people actually try to bend the iPhone by hand, finding the 6 harder (almost impossible) to bend by hand but not the 6+. According to CR they bend at the same lbs which is likely true but hard to get your hands on it with the same leverage just showing all the variables here.
Lets keep in mind that this all started from people actually reporting bending phones. There were several on this forum only a day after the phone was released. Only then did these test (albeit stupid test) of bending phones start.
Personally I'll worry about it when I have a problem with it. If I bought products based on what COULD go wrong I wouldn't own anything.
^ THIS. Thank god there are some normal people on this forum. Rest just defend apple till death...