Yep. But if you have 40% of Congress, you can get things done with a little negotiations. If you've 0% you're getting nothing done.
That's true. Although it depends on how willing members of the other side are to negotiate, and work across the aisle. In a perfect world, our elected leaders would prioritize getting things done for the American people over the tribal partisanship. But as has become apparent, we definitely do not live in a perfect world.