It didn't require it; it was optional depending on how you used ExtJS. In a project I worked on we simply had the minified, master extjs.min.js file included an

It didn't require it; it was optional depending on how you used ExtJS. In a project I worked on we simply had the minified, master extjs.min.js file included and then we simply referenced and used that. I don't remember how the build stuff differed but it wasn't required (though I'm sure there was a benefit to using it).