Its also a modern form of insulation.

50yrs ago you could delegate knowing a soldier would never roll. And if he was caught, he'd take the pinch.

Now anybody and everybody can and does roll. So doing the job yourself is protection from an underling rolling and pointing the finger.

MORGAN: Why didn't you fight him at the park if you wanted to? I'm not goin' now, I'm eatin' my snack.
CHUCKIE: Morgan, Let's go.
MORGAN: I'm serious Chuckie, I ain't goin'.
WILL: So don't go.