DPS display could easily be solved with a system already in game.

[Almalexia]

As I said before, can't see the trees through the forest, it's a hypothetical analogy for mechanics lowering your dps due to just plain old RNG picking on you for that run.

Almost every marking mechanic in endgame can be handled while preserving GL. Your "hypothetical example" evidences a monk who has more to learn, or a monk dealing with a very specific encounter.

Do you believe this is reason enough to forbid parsers? Because one extraordinarily unlucky monk needs to git gud?