Fine, but if that's your point, don't say "Why not use C all the time by default then?" Actually make that point, rather than leaving us all guessing as to what your point is, and more important, why it's your point.

And, as I said, "Why not use C all the time by default then?" does not actually follow as the logical endpoint of the argument that your trying to answer, so making that your response really doesn't contribute much to the advancement of the conversation.