A problem I see in every thread about BR, SC, Unity system or whatever, is that... why to bother on using any of this, If any mob may die in less than 10 sec??

It would only be useful for NM's, and a system that it's only used on Big bosses... it probably wouldn't be used for many people.

First of all, let's SE redo all the battle system, and we can start speculating about BR, SC or a whole new system.