My greatest disappointment in the past year has been payment:

(1) No 1-click purchase, please:
There should be a confirmation button to make payment, instead of a 1-click purchase button that doesn't warn me that it's a 1-click purchase button.

(2) Set default payment currency:
I prefer to pay in USD, but when I extended my subscription during this last Black Friday, the payment menu just automatically changed to EUR. My Settings page was definitely NOT set to EUR, and without my realization, the subscription was charged in EUR (which was way more expensive than CHF and USD) and, because of the 1-click setting during that Black Friday promotion, I couldn't change it.