This is what Donttalk said:
"I mean, on the stuff exploding directly into ones face thing I can't say anything helpful and not really put anything helpful on the page either.
That is a decision so ancient that even I barely remember.
Guess it goes in the same vein of us not really subtracting environmental damage from the power of an attack when we determine durability and that it is not too far of the actual result anyways. Basically another simplification for scaling.
As for the meteor thing... it kinda depends IMO.
If the meteor breaks apart on impacting the character and the parts that don't hit the character aren't slowed then yes.
If the meteor hits the character and its KE is mostly cancelled out on impact then the entire meteor should scale on the other hand.
In a case where the meteor stays intact on impact and the KE doesn't visibly get cancelled out things get difficult. In that case, the surface area isn't really what matters IMO. The impact energy isn't really "missing" the character, which is the idea we usually use for inverse-square rulings. Like, in an idealized scenario where the character stands on an indestructible floor it would need to take 100% of the impact, as the parts of the meteor that don't hit the character can't fly past it without the meteor breaking apart.
With a destructible floor, things get more difficult. The impact would press the character into the earth and then the impact is split between it and the earth that gets hit. If this were real-life physics I would say calculate the energy to cause the displayed amount of destruction to the floor, subtract it from the meteors KE and the result is the difference that the character being there made. However, in fiction, we have the trouble with the AoE not reflecting power.
So that makes that difficult. Personally, I would say that by The Rules of Fiction™ the character is probably comparable to the attack's power. Similar to how we would scale a character that gets hit by an energy beam and flung out of its path without absorbing 100% of the beam to the attackers AP. Maybe err on the side of caution and downscale a character by a tier if the AP was close to baseline.
That's my take at least."
Take that if it is suitable for usable calculations