8 GB has been the norm since around 2007, then 16 GB from about 2013 onwards.The adult MBP temper-tantrums happen every year and I don't see them stopping, unfortunately. As you said, these people created their own "pro" logical fallacy and then get mad at Apple for not meeting their logical fallacy expectation. I also think many of the MBP folks around here hate the idea that the MBP is also for the common folk. The forum has created a status symbol with the MBP and when the base comes with 8GB of RAM, it crushes their idea of having an elitist Mac.
One of the wealthiest companies to be so cheap on RAM and charging extreme markup for upgrades is pathetic, especially knowing that it will almost certainly be the bottleneck that makes the device slow down in just a few years (well unless the extra paging to the soldered SSD from being RAM-starved kills that first, I suppose).