Streamlining is taking something that requires 4 actions to complete and changing it to be completed in 2 actions instead WITHOUT a loss of functionality.
Dumbing down is taking something that requires 4 actions to complete and changing it to a single action and only half as functional.
Magic in Skyrim is the perfect example. They removed nearly all the functionality of spells from the players control. Want to add soul trap to your long range fireball? Sorry can't do it in Skyrim. Loss of functionality. It was dumbed down. If it was streamlined instead they would have kept ALL the functionality of spells from previous games and simply changed the mechanics of them to be easier to use. Example Duel-casting a fireball spell in one hand with a soul trap in another. The soul trap effect could have been added to the fireball on casting. That would have been a streamlined mechanic.
When stuff is actually removed, then it was dumbed down.
I am guessing balance isn't important to you then.
and in you example did you mean casting in a duel or dual casting?if the latter you would need 3 hands
