The thing is that while a lot of things that seem obvious will be confirmed, a lot of seemingly obvious things will turn out to not be true. So we need to apply scientific methods in order to determine which “truths” really are true and which are not. (In cases where the truth is testable — not everything is.)

Beyond that, the fact that they have identified what receptors the mosquitoes use for sensing sweat means, like the article says, that new ways to foil the mosquitoes from sensing humans might be possible to devise in the future.