Why fight when you can do sac and pull and revive. More skills unlocked = faster ways to cheese the dungeon.
If ppl did this then SE would be like wtf . They'll then have to either re work dungeons that didn't need it in order to compensate the new amount of skills unlocked or they'll have to take it out and leave it as it is.
You can still interact with the objectives as no mob will be interrupting you.
