This is a small but real trend. My experience at a company that went deep into expanding beyond/removing some of the 12 Factors is that it breaks portability of containerized software built with those assumptions. There were a few times I needed to install a vendor product or open source project that was built to the 12 factors but spent a month or more just building a shim to make it conform to our particular bend on it. I’m sure there are good reasons to deviate but I wasn’t particularly impressed with our decisions and more importantly why we made them.