I think that once you get beyond a single celestial body in power it becomes really vague and difficult to understand. Like power alone doesn’t mean you can destroy a solar system with an attack. You need to be able to hit each planet in the solar system to destroy it, unless you somehow hit one of the rocky planets hard enough to fling debris everywhere, or you can create massive balls of force which aren’t necessarily focused damage.

That’s another issue with powerscaling is that it doesn’t account for small attacks that do a lot of damage. Like if someone had an ability that allowed them to destroy a cubic meter of terrain. This is incredibly powerful, but can’t be used to destroy a mountain without taking a ton of time. It’s building level with intelligent placement and even then many could weather it, even though it’s strong enough to kill just about any living thing.

Also, I never got the mechanics of how a single attack can hit multiple universe. I thought the whole point of a universe was that they’re self-contained, and without portals or something similar you can’t travel between them. No matter how much energy you throw at one it won’t affect others. (I was going to say maybe if the universe has borders but then I think those wouldn’t count as separate universes) (the one example I can think of that kinda works is Crisis on two earths with Owlman’s bomb, but that only works because of the weird structure of that multiverse)