I'm sure this similarity has been pointed out before, but I think JSX is tangible for many of the same reasons PHP templating was. It only makes sense that a company that operates predominately in PHP would pass the baton of markup interpolation to JS as the web becomes more client oriented.

I personally lean towards logic interpolation (Handlebars, AngularJS), but both have their potentials for abuse. I don't know enough about JSX to say one way or the other what good practices are enforced and what bad practices are available.