Is your feature request related to a problem? Please describe.
In Shadowlands DPS warriors and paladins get abilities like shield of the righeousness and shield block that require shield to be equipped.

Describe the solution you'd like
A fake 'Defensive stance' bar swapping based on [equipped:Shields] conditional. And it's only for Arms, Fury and Retribution

btw the weapon types in this conditional is locale-dependent and the best way i know to query the translated shields name is select(3,GetItemInfoInstant(32375))

This should be implemented in the latest 9.0.0-beta3. This is what you can use to get Shields back from the API:

local name = GetItemSubClassInfo(LE_ITEM_CLASS_ARMOR, LE_ITEM_ARMOR_SHIELD)

Thanks!