Would you like an in-game parser?

[Legion88]

And how do you know the rotation is good? How do you know what you melded is good? How will you find out if what you want to meld is better or not? A parser outside of endgame.

Yeah, it isn't needed in leveling content. Hell you can play just fine without one period. But being able to compare yourself and track improvements outside endgame helps you know what you are doing when you do hit end game.

A parser in SSS or on dummies, there you can test your melds and rotation.
For casual and leveling content a performance ranking would be sufficient imo.