"but with ZEN AMD still makes enough to at least stay above water."? Are you kidding? Their are plenty of reputable sources that show how much market share AMD has taken away from Intel since 2017. I would hardly call what AMD as doing as just staying above water.Producing 14nm has become super cheap after so many pluses and being able to finally add additional cores without killing off AMD completely made them able to sell much more product.
A lot of people wouldn't upgrade their systems because going from 4/8 cores to 4/8 cores wasn't enough of an upgrade for most people.
If they added more cores before ZEN came out AMD would be dead right now but with ZEN AMD still makes enough to at least stay above water.