It seems the developers are having trouble with making Krivis attractive for Daino without making Krivis absolutely necessary. The current compromise- Simony scrolls, makes Krivis party members obsolete.
Here’s my suggested solution:
First, instead of just having the most recent buffs overwrite the oldest buffs, make buff priority player-customizable. Give players access to a window that lists all buffs they’ve ever received before, where they can rank which buffs get top priority when their buff limit is exceeded.
This change will make it so Daino is not absolutely necessary, while still attractive.
Second, Simony needs to be rethought. As it currently stands, any skill that can be put to a Simony scroll becomes obsolete. So, the most useful skills are simply banned from Simony scrolls to ensure that the classes are not replaced by scrolls alone. But by banning the most useful skills, it makes Simony itself useless.
There is no solution to this problem unless Simony is rethought altogether.
My suggestion here is to lift the ban on all or most skills from being made into scrolls, and instead limit their use in a different way: by setting a very long cooldown (something like 10 minutes) on the use of Simony scrolls.
This will ensure Simony scrolls are still attractive, but not at all a replacement for their class.