Power-scaling = Omega one-shots Beerus without even trying.
"To destroy the universe in 3 blows you need to be above SSj4 Gogeta"
Completely baseless assumption.
I'm ain't talking about Shenron's power, i'm talking about how he feared Beerus and broke his character.
If we go by this logic, then Broly is about as strong as Beerus because Vegeta broke his "arrogant, prideful" character when he faced both Broly and Beerus.
Omega can destroy universe but he can't do it instantly like Beerus who is able to destroy every worlds in existence of U7 like @User avatar Tosh posted yesterday.
Beerus would need a few seconds to destroy the universe completely, just like Omega needed only a few seconds to expand the power of the Negative Karma Ball and destroy the universe completely.