As a rule, no. But I often drive on I-70 from Indiana to Ohio. Sometimes, I go +5 mph above the stated speed limit, based on traffic. But most of the time, I drive at the speed limit and cars just pass me. And during rush hour on 465 around Indy, you have to go +5 mph above speed limit to keep with traffic. But that is mostly during rush hour. During other hours when there is less traffic, you can usually go at the speed limit. And driving around my city of Terre Haute, I never exceed the speed limit.
Again, I am not saying that there are not cases where traffic exceeds the speed limit. But I don't agree that L2 that stays at the speed limit is completely useless.