people ask questions they already know because they don't know what others think. because they're interested in how others have come to their own views, and how they see those views fit into the way the world is. how everything connects up for them
It helps you uncover the challenges you're facing and generate better solutions to solve those problems. ... If you're asking a question, you're not rushing in to provide the answer, give the solution, or take on the challenge.
Asking question is important because to know the other opinions