That's not a squish , that's the Megadamage solution. You can't fix a exponential grow problem with a flat X% reduction .I don't think people quite get how this works. Everything is in a database, all weapons, NPCs, PCs, spells, etc... All someone needs to do is go into the database and apply a 10% reduction.
Squish is transforming an exponential progresion in a liniar one. Go take math lessons.
It's quite interesting how the people who don't understand math , and don't understand what will really happen , complain that the other guys "don't understand".