Yahtzee in this Extra Punctuation column argued that boss battles ought to fit in with the rest of the game. That is, a boss battle should not require the gamer to rely on a specific set of skills which have hitherto been considered optional in the game. A good example is that if a game gives you the option of creating a super stealthy character rather than a brute force fighter, the boss battle should not be winnable only by brute force. I agree. In the comments on his column the following opinion was expressed:
Well, some skills are better than others and if you did not select the skills which would allow you to win the boss battle, then it just sucks to be you. It is like real life. If you are trained in nuclear physics, you are unlikely to survive a fight with a ninja.
This is a paraphrase capturing the gist of the original statement. I do not cite because it would open issues I don’t want to deal with. I’m going to explain why this opinion is terrible.