The perspective of this is so wrong. Minecraft was a Plaything for notch, he wrote the beginnings of it in his free time while working for a different company. He certainly never thought of or even optimized it for being a massive world wide hitgame that needs a consistent modding API. If he did that, i am sure that Minecraft would probably never have seen the light of day as he would have lost interest in it, because most of all it was a sideproject to creatively explore an idea.

Coming in years later when everything has grown tremendously and saying that many of the early design decision were wrong, is so ignorant it infuriates me.