"ignorant"? That's really jumping to conclusions...

I've worked with DDR, DDR2, PCI, PCIe, and USB (2.0 only, but that's still 480MHz), in mass-produced designs. Also some proprietary busses operating in the 600-800MHz range. It doesn't have to be perfect. That is what is so great about digital signaling.

My post is more of a "I know from experience how much you can get away with, and fancy test equipment that can tell the difference does not always reflect how something performs in practice."

On the other hand, I won't comment on high-frequency true analogue stuff like microwave/RF.