While I understand the dev's frustration with people rating the game based on parts 1 and 2, I personally think removing them will do more harm than good. After all, to get the full story, they would have to start from part 1 anyway. If they were to start from part 3, they would only have a faint clue of what is going of from the intro. Plus, they'll be missing the scenes from those parts.
Consider how many people come in here asking "do I need to download each part or part 4 has everything?". Im not looking forward to having to answer "where are parts 1 and 2?" on top of that.