Having an in game parse will not make players get better. Reading your skills and using them properly will.

Parse is helpful to those who are testing different kind of openers and rotations. Wearing the same item level but with different stats to compare results, it helps to have better understanding for stats and their weights.

Rest of the community are mostly reading and implementing guides, you don't need a parse for that. Practice the rotation and go to Stone, Sky, Sea to test yourself. Would be helpful if Stone, Sky, Sea showed a summary at the end with your crit rate and number of misses since these two affect your dps the most.