In practice, working in small and medium organizations, I have met very few UX designers. Instead I have met plenty of graphical designers that know almost nothing about UX design. I've been at places where I - as a backend developer - know more about practical UX design than anyone on the design team.
I think the reason why we have "bad mobile first design with awful desktop UX" is because very few of the people designing these experiences are UX designers.
I was surprised the article didn't highlight the horror show that is Vector22 at Wikipedia, a design so colossally bad that after three years of suck costs the only path to saving face was to make it the default theme for all users: "Mission Accomplished!"