I thought the article was a good read and I liked what I saw but I have only one issue with the article, and I'm no genius or anything but the quad crossfire you mentioned sounds kind of silly. You should of mentioned how it would work with the available pcie lanes Ryzen has. I may not be 100% correct here and pcie lane configs may be different across different boards but...
As far as I am aware, Ryzen only has 24 pcie lanes, (some are disabled). 16 for dedicated graphics, 4 for storage and 4 for the chipset. If the board really had two x16 slots and you chose to do crossfire, you would get two cards running in x8 mode but! only if all of your x1 slots are empty. If you were doing crossfire with two cards and you put something in one of the x1 slots it would drop your crossfire configuration to x4 mode. quad crossfire in x4 mode sounds goofy!
It could make sense for a minor maybe but then again they wouldn't buy this board for that purpose.