Originally Posted by TheFlamingCoco
And yet, no magic for IronMan 3 :P
Well, seeing as how there was never magic involving The Mandarin to begin with I don't see why that's a problem.
And either way, it's about conservation of detail. If you spend too much time explaining things in a story then you need a simpler explanation. The alien rings would have taken a lot more time to explain than Extremis, and Extremis was able to serve multiple functions in the story instead of just one. Changing the Mandarin's power from the rings to Extremis just made the story a lot less complicated.