I'll try and make the point as clearly as i can.

Firstly i'm not trying to say Muted soul is the best choice or even better than diabolic eye.

What i'm trying to say is that I never use Deye and therefore would rather have -50 Enmity even if i don't use it much if at all.

I have alot of reasons why i feel Diabolic eye 5/5 isn't useful for me and i'll try to go over them as simply as i can.

1. Is the HP loss. This will always be my main reason since most stuff were acc matters can deal alot of DMG and reguardless of One shot after an AoE DRK is not No.1 on a WHMs list so being able to last a little longer makes HP more important than a few % of DMG for me and my linkshell. (I feel this point is mute/reduced by any DRK with a Weapon that can allow the DRK to heal themselfs)

2. 3 of 5 mins of acc if it was 5 of 5 mins of acc here would be times were I'd change food choices when i'd fight mobs in the 80-85% region of hit rate the problem is that if i am <85% where Deye is most effective i will always use food to capp my acc even if it means using Sushi.
The other way of putting this is the only range i find Deye to be effective is on mobs where my hit rate it 85-90 which for me is so rare it's not worth thinking about.

3. Thirdly and the point you missed. All the situation u mentioned i'm not even on DRK so your basically arguing to me that Muted souls is useless so merit Deye so u can look at on your merit list as SMN or SCH when ur fighting T3-4 VWNM. Maybe if i do start going as DRK i'll change my merits atm useless v useless so i'm choosing useless.