XF doesn't use that much of Zend Framework...the knowledge isn't as transferable as you'd expect. When people refer to "using" ZF, they mean the full stack framework, particularly the MVC stuff. That is all custom in XF.
Now, if a programmer is competent with Zend Framework, programming is programming, and add-on development for XF is more like regular programming. It's not as random as it is with vBulletin.
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