Among other things, these two hearings illustrate a basic, important point. Obstruction is very important. But the real issue is the collusion, the active encouragement and acceptance of help from a foreign power. In other words, the underlying substance.
Obstruction is important in large part because it blocked getting the full story. The most important point here has never been narrowly statutory crimes. It’s the President’s betrayal of his country to get elected. That’s what matters.