Honestly, I think that's some of the reason why they still wear the mask sometimes.She may not like going out because she can't stand the recognition anymore.. bunch of commoners pawing at her!
They're trying to remain anonymous, dependent upon their mood, to avoid being spotted by the stans for incessant selfies (like today's spotting at the outlets, which evidently didn't work ).
Cuz there truly is zero rhyme or reason as to when it's been on and when it's been off.