There are two Parries.

There is Parry: the mechanic itself
And there is Parry: the secondary stat

Both can be criticized for whatever reason. FAIK Square Enix only acknowledged that Parry *the seconary stat* was underwhelming, and they all looking ways to address it.

So I'm not expecting more from them than just increasing Parry proc rate per point of secondary, or moving away from linear scaling and have parry chance be based off enemy iLVL vs Player Parry secondary stat (similar to enemy evasion VS player Accuracy).

Either way won't change much, because the Parry mechanic itself is probably never better than even the smallest increase in DPS via Crit/Det,