Porting? What??

As a designer I had never heard the term "porting" before and read this article by http://www.rightrelevance.com

nounAutomotive, Machinery.

1. the changing of the size, shape, or location of the intake and exhaust ports in an internal-combustion engine, generally to improve performance.

So... the question of the day is in response to this article - what changes are you guys making across the platforms that would upset a user? As a branding manager, the look and feel is a given. However, navigation must change from desktop to tablet to mobile. I was wondering if porting your designs effects good UX, then what is considered major changes that do this?

Is it icon use? or are some designers reinvisioning everything from scratch each page? it only stands as a UI designer to work on a 12 grid system that would inline your designs based on screen and retina display. Same elements chosen in a hierarchy of information. Sometimes, yes its very important to eliminate extra navigation (like sub sub navs) to prevent overload on a sandwhich menu.... but I need feedback on to how reporting porting works to interfere with the design? Got an idea? Hit me up at heather(at)siteimages.com.