A rushed game sometimes can't be helped when it comes to publisher demands. More than a few "could have been great" games have been ruined that way.
From Software self-published Dark Souls in Japan. They only partnered with Scamco for the global release. So, it couldn`t have been publisher demands.
Also, remember, Demon's Souls was rather glitchy upon its release as well. Soul duping was even easier in the early version of Demon's than in Dark.
I bought the Asian version of Demon`s Souls shortly after it had come out and I don`t recall it having anywhere near as many glitches. What was the soul duping glitch again? I wasn`t frequenting the DS board on Gamefaqs too much at the time of release, so perhaps I just missed it.
Plus the dragon head one is really out of the way to activate. I've seen it described as being the kind of crazy playground rumor we'd have heard for older games given the bizarre method, except it's for real.
But how could they miss something as obvious as the magic shield glitch? All you have to do to activate it is cast the spell and BAM - you`re completely invincible.
In other news, 1.05 was released in Japan a few days ago. It improves co-op and PvP by making summon signs easier to appear and decreasing the number of connection failures. Meanwhile, Scamco is silent and we`re still on 1.03.