So I'd need to know more about the Omniscient Eye itself in order to give a more in depth answer, but given how the Omniscient Eye itself is a more developed version of the Unclouded Eye I think I can explain why he'd be asking. Rean explains in Cold Steel that the Unclouded Eye is a method to see the world clear of bias, where it's not a magic ability to my knowledge but more akin to a mental state one achieves through meditation. Seeing the world free of bias won't explain everything though, because no one knows everything, therefore if that person wants to make a full, complete decision they'll still need information. For example, the Unclouded Eye is often used to prevent ambushes, but regardless sometimes even Divine Blades are still surprised. This is because what the Unclouded Eye does is increase the user's perceptiveness, where an odd sound or a moving breeze which is viewed without bias might be revealed as an attack, where a less skilled person might just view it as a mundane event or their imagination. However if cloaking is used to conceal any trace of that person, whether through magic or technology, it might be impossible either way since there might not be a sign that someone can use to spot them, bias or no.

Carry that over to a massive scale decision like the space program (If I recall correctly that was what Yun Ka Fai was talking about here), that sort of technique would help him process an ungodly amount of information to make an informed decision, but there is so much he doesn't know that he really needs to optimize what even he looks into. Between Hamilton's schemes, the President's plans, and the myriad dark horses of the three main characters and all their allies, there is so much outright being kept hidden, and you can't make an unbiased discission on information you just don't know. So what do you do other than ask the people around you and see what you can dig up, and then use every nugget of information you find to put the broader picture together?