People will ask to be able to Parry while stunned next. And then for parry to mitigate magic damage. Block is really an old throwback to when PLD didn't have self-sustain built into its rotation. It's an antiquated advantage that the job has been grandfathered into, but now that you're thankfully drawing focus to it there's a reason to standardize the mechanics such that it's fair across all tanks. Good work.