It's DHH marketing style (it sez right there in his earlier book: pick a fight).
Back when Rails burst into the scene, he picked the EJB mountain to battle and positioned Rails vs EJB for as long as he could.
This is another battle in the Infrastructure world that he picked.
The timing was perfect too: Rails grew during economy crisis 2006-2009 (layoff, EJB complexity, web-app complexity, the rise of single-developer entrepreneur). Right now we're sort of in similar situation too: layoffs, infrastructure complexity, BigTech culture, FAANG-leetcode grind.
Back when Rails burst into the scene, he picked the EJB mountain to battle and positioned Rails vs EJB for as long as he could.
This is another battle in the Infrastructure world that he picked.
The timing was perfect too: Rails grew during economy crisis 2006-2009 (layoff, EJB complexity, web-app complexity, the rise of single-developer entrepreneur). Right now we're sort of in similar situation too: layoffs, infrastructure complexity, BigTech culture, FAANG-leetcode grind.
Tech is like a cycle :)