It does not matter what you think they should do. The only thing that matters is what they actually do.

And they do fail if candidates do not grasp what the topic asked. If you don't know what a topic is, don't choose it. If they ask you to write an essay on Fatima Jinnah and you write about Muhammad Ali Jinnah, and later say that only ideas should matter, that won't be a very rational excuse. If you say both sounded like Jinnah, even then the excuse will be dumb. Sorry to be harsh. But I give you facts. I have wasted many a precious years of my life running after this. I know stuff (ghaat ghaat ka paani pia hai bhai)

I admire your name though. Like your optimism regarding the world in general and FPSC examiners in particular.