Q:
Trait Boons on Illusions, do they stack ?
It’s a “known bug”. Currently like you said some traits disable others. We assume it’s a bug. But I don’t believe anyone at ANet said anything whether it’s intentional or not. At least not that I know of. I’m guessing not, as this would essentially make two trait trees cancel each other out, but like I said we just don’t know for sure.
Its a little bugged at the moment.
Id recommend reading this post
i did some test with gravelings, seem that retailation works but just the icon wont show up