I mean, if they instead had a system that could scale those numbers with character level, they'd never have to add another spell or ability to the game, ever. There's no reason I need 500 spells that all do fire based DD. Just give me 1 spell, "Fire Ball", that scales to character level and I can use it forever.
They already have a way to achieve this with ranks but they're not very creative. Once they added spell ranks they should of stopped the copy and paste of the same spells with new names.