Changing magic item durations cause unintended consequences?

[Ravingdork]

Magic Items, Wearers, and Durations: If a magic item grants an effect with a duration to the wearer, can I put it on, activate the effect, take it off, and keep the effect active?

No, as soon as you remove an item that grants an effect to the wearer, you are no longer the wearer, so any remaining duration immediately expires. The same is true if the item affects the owner, wielder, and so on. If the item's effect does not specify the recipient as the wearer (or owner, wielder, etc), then unless it says otherwise, it remains when the item is removed.

Just saw this new FAQ entry and I was wondering: Are there any unintended consequences that might arise out of it, such as an existing item not working as intended?

[Magda Luckbender]

Consider a Potion of Enlarge Person. This spell has a duration of 1 minute per level. If you change the spell's duration to 10 rounds per level (the exact same duration), or even shorten it to 5 rounds per level, it actually becomes much more useful. This because every polearm fighter wants the Sipping Jacket to work with a Potion of Enlarge Person, but it does not. If you shorten the duration of the spell, to something measured in rounds per level, it then works with a Sipping Jacket. A theoretical worse version of Enlarge Person, with shorter duration, has the unintended consequence that it is much more useful.