Because they don't care about performances. They just want you to not pirate the game for the first couple weeks after release so they can make the most sales money, then once the crack is out, they remove Denuvo...or not.
The security is for their benefit not yours, so they don't have a reason to trust your hardware over proprietary software they control.
But maybe I'm wrong, I'm just assuming. I'm not a dickhead using Denuvo.
Counter argument: A tidy looking room makes me happier. Time you enjoy wasting is not wasted time, ergo, making your bed is not wasted time.
If your house is the reflection of your mental state, then the other way around is also true.