This skill was nerfed back then because of people using it in raids and bouncing other people's conditions, thus duplicating them.
As an open world player I inflict my own condition damage to mobs then use epidemic. So these two situations are completely unrelated,
I'm not spreading conditions which were inflicted by someone else.
Epidemic should spread conditions with their 100% remaining duration if they are originally inflicted by your own character.
Other people's conditions can be spread with their 50% remaining duration just like now.
This way, Necromancers can be as fun as they used to be in PvE. This seperation should really be made in my opinion.
As an open world player I think we shouldn't be punished for what particular Raid community does.