DI/IoC is really useful and flexible. There are good reasons why most of the Java world uses Spring! This is definitely something we'll be continuing in "Deft JS 5" (or whatever we call it).Well I'm already using Deft JS for promises so that saves me some upgrade time! I've been on the fence about using Deft DI since I thought our Deft dependency might go away if Ext JS 5 had promises. If Ext JS 5 doesn't include promises I might as well use more of what Deft JS offers!