Nevalistis ha spiegato che il team preferisce evitare modifiche retroattive per non causare bug o interazioni non previste con gli oggetti già ottenuti, senza contare i possibili vantaggi che potrebbero garantire rispetto a quelli rivisti (specie per le corse alla ladder).
Nevalistis ha scritto
If you've tested with us in the past, you may have noticed that, often when we make changes to Legendary or Set items, only changes to Set Item powers are retroactive. There is a reason for this.
The powers as they exist on Set Items have no variables. You always get a particular value, regardless of whether that item is Ancient or Primal.
Powers on Legendary items, however, generally include variables. Retroactively applying an update to these kinds of items is much trickier, especially when it comes to generating unintended consequences or bugs. Do we issue rerolls to all the existing items? Are players okay with the potential that their existing item may turn out worse than it was prior to the patch? Does making the change create cases where legacy items might end up more powerful than the intended new level?
Simply put, it creates a lot of potential database issues, and the best way to ensure everyone stays on equal footing is to deprecate the older version of the items. When items are updated like this, they are technically dropping as entirely new items, which is why existing ones don't update.
This accomplishes two important philosophical goals: Ensuring legacy versions of items don't stay more powerful than newer, obtainable versions and maintains an equal playing field for everyone (everyone has the same new goal).
Primals with their static nature raise an interesting question, but similar complications. I'm happy to pass this concern on, but to stay consistent with our item change philosophy, we will continue to only retroactively change Set Items.