I see dice rolls being useful in certain rare circumstances. For example, if someone is shooting at someone else and you are up in the air if bullets would be hitting and how many. Sometimes it's a struggle to be fair and logical in such circumstances, leading me to worry if I'm being unfairly accurate or, if I'm dodging, unfairly dodging everything. I tend to just take the hit if there's questionable stuff. 

As a main fight mechanic it's not preferred if going for realism but could keep things more exciting where you aren't sure how it will turn out and have to adapt. Could also be funny if you roll a 1 and have to come up with some rediculous reason why your character failed so badly.

Not using dice and instead going for story purposes and rule of cool would be best if you and your opponent aren't competitive. Then I wouldn't have to worry about accidentally abusing stuff and being op because they would be okay with the outcomes.