You don’t want to fight the final boss guy right at the start, for two reasons.
Firstly, you don’t stand a chance. If you go up against the final boss guy at the start, you will surely lose. You need to play through the game, to collect the big weapons. You need the right tools for the job, in order to maximise the probability of success when you finally do meet him.
Secondly, the final boss guy is exactly that – final. Once you’ve defeated him, you turn the computer off. If you get your satisfaction solely from beating the final boss guy, then that’s fine. But I want the game to be long, rewarding and constantly changing. I don’t necessarily want to discover every secret area, but at least a few of them.
This metaphor for life was brought to you by the same people that brought you Jelly Baby curry.