The reason for enrage timers is to prevent groups from stumbling over themselves to achieve victory. It's also a means to encourage people to learn their classes and work efficiently, as well as get proper gear rather than just stacking things to give them enough HP to survive everything.
However, to think that a DPS check requires a parser is silly. It's like assuming car racing requires a speedometer. You can still win a race without knowing exactly how fast you were going.
