Ease of use isn't the only metric for "peak UX" though, composability and how the programs interact should also be taken into consideration. Selecting a filter

Ease of use isn't the only metric for "peak UX" though, composability and how the programs interact should also be taken into consideration. Selecting a filter on instagram is very easy, with the caveat that you're limited to those filters alone. The subject is more complex than clicking buttons vs typing commands.