IA itself put this as a possibility. This is my take over their idea
You can apply the mark on more than one enemy. I tought it was an obvious thing
You need to give players a choice. That is its point
You are ok with the shield and not with this? Weird but I understand and expected this kind of feeling
As I stated at the start of the og post, in my opinion boosters have a lot of potential and I wanted to give my vision of the feature: Not weapon boosting abilities but activable abilities.