And how often are the presentation and logic changed in isolation of each other... they aren't separate concerns at many levels. The concern is sepearated in React at a component level... how a component is rendered is just as important as how it raises/accepts changes outside of itself, and often interacts.

Also, having JSX in my JS is much easier to deal with than remembering some abstract DSL for how to iterate through children in a template language. It's no more goofy.