[Shujin]

I know back then when that was introduced I too was a bit sad about Eviter/IPG not really working together just by having them equipped even though they both function alot different and would work in different stages of the fight (IPG for general all around defense during activation time, Eviter for when you drop the IPG for offense or rather play with less buffing in that encounter.)
Alas it didn't quite work.

I do not think it be truly a problem if only one applicable skill can trigger per round regardless of successful roll or not. But given how most Parries cover different weaknesses it can be useful to slot two. Its weird that it sometimes flat-out nulls both. Though I too remember dev saying that he more or less had this on purpose?

Alas maybe his opinion changed as most Parries got significantly weaker now adays. *shrug* I'd like the option atleast.