I can agree that this would an interesting approach and equally ask for a more tactical approach which is one of the goals I also have in mind. I like the idea so much that I actually made it myself 16 months ago :P:
See section 1. for my description on how it works. But it is the same idea. Though, as I initially wrote. The solutions looks very elegant on paper (and I would welcome it), however it would mean that the game is able to count the number of active vortexes and able to apply them to the damage calculator. So, from the coding side this might be more tricky and most likely prone to errors. And FS either seems to be reluctant introducing new “concepts” or somehow came to think that Coruscation Staff is “balanced”.
Which is why I opted for the simplest solution existing of reverting to pre-release, in the first step. Because that line of coding should exist somewhere already.
There is also a minor issue with transparency on how the staff works, though Coruscation is kinda odd in that regard already.