Wow, I can't believe you're willing to waste multiple just to make people digest your biased opinion.
The need for die-cast should be taken in a case by case basis. As for transformable toys, I think I would rather stick with plastic... all those pieces rubbing together is a sure fire way to peel or sratch the paint. I love the Takara BTs but I'm more impressed by the quality of the Alternators. The paint looks great on the plastic as well. And there's no way to mold diecast to the color desired... it has to be painted on.
Would you prefer all your action figures in diecast? Diecast is clearly not the the right material for figures, so obviously plastic is better there.... unless it's robocop or the termonator endo, then I'd have to wish for die cast.
The Toynami Alpha is another good example... why the hell would you make the forearm boosters die-cast? It served no purpose and it made the arm to heavy to pose effectively. PLastic was clearly the better material in that case.
The only toy I would love in die-cast right now is a 12" robocop, if they ever made one. Or a vanship from Last Exile... that would kick ass...
I'm glad the Konig will be mostly plastic, I can imagine all the parts that is moved in transformation would be in danger of scrathes.