It's not physically possible for an MMO to have every person on Earth achieve a low latency connection since they're inherently centralized. For that reason it's critical the game in all aspects is tested at all times with non-ideal conditions. A simple change: do all development testing from JP to the NA DC.

There's no good technical justification for the behavior the client takes for GCD locking. Players should not have an explicitly granted advantage based on where they live. That alone is justification enough to change this behavior.