I know, its adjustments went in for Publish 25, which I'm sure you know I have a special kind of attachment to, it was in tandem to these..
# Lowered cure spell chance of success
# Enhanced cure potions now correctly cure lower poisons
# Archcure doesn't cure aggressors or victims
# Archcure is now 1/4 second faster
Number 1 had to be done, I had no way to prevent or stop that, however number 3 and 4 were my counter in order to prevent disaster.
It's the only spell to cast faster than it's circle, for very good reason.
It's not an individual change you can just reverse, without those changes it would have been a huge issue back then, one that this opens the box to set free now.
Essentially, what it does is mean that if you don't have cure potions, you're going to die to anything over level 3 poison and there's nothing you can do about it.
Remove it's area of effect if you feel something needs to be done about it, that's not how it's used anyway. It changed from being an AoE cure to being the only way to cure high level poison using magery, which was the exact intention of those small adjustments.