It allows us to wear two other trinkets.
Like I use one titan disc trinket(95 resilience) and one of those "Use: +3ksomething health with 190 AP" trinkets.
It's nothing major, but it not bad.
And it has its uses in PvE.
Example: Eadric the Pure's stun can be dispelled with it.
In fact, I value it more in PvE than PvP.