I wonder how much of it is actually 'its too complicated/there's information overload' because of the way the system actually works, and how much is simply how overly verbose the prayer's tooltip is. For example, we look at current Redemption, and it just says 'Heals you when damaged and health falls below 10%.'
The pitched Seren prayer Harmonize, which rewards players hitting together on the same tick, says stuff about applying a whole new status effect, and while that may be the way 'under the hood' to get the game to behave and actually apply that prayer's effect, us players are going to immediately think of other MMOs where maintaining a status effect is an active part of the gameplay. So instead, wording it as something more like:
- + X% Attack when your attack lands at the same time as an ally
It's simple, to the point, we don't need to know about the existence of 'Vulnerability' as a status, we just need to know 'if we hit at the same time ...