Well, I don't see how you can know there is no evidence if it's being blocked and not investigated. Sure you are are right about generating more "drama", but you can't say with any amount of certainty that there is no new evidence.
"Obstruction of justice, in United States jurisdictions, is a crime consisting of obstructing prosecutors, investigators, or other government officials. Common law jurisdictions other than the United States tend to use the wider offense of perverting the course of justice.
Obstruction is a broad crime that may include acts such as perjury, making false statements to officials, witness tampering, jury tampering, destruction of evidence, and many others. Obstruction also applies to overt coercion of court or government officials via the means of threats or actual physical harm, and also applying to deliberate sedition against a court official to undermine the appearance of legitimate authority."
And abuse of power may not be technically, a crime , but it sure is an impeachable offence.