I also forgot to mention we provide optimistic UI features with our loading states and annotations. For example, in the screencast, the "Save" button has phx-di

I also forgot to mention we provide optimistic UI features with our loading states and annotations. For example, in the screencast, the "Save" button has phx-disable-with="Saving...", which applies on client instantly and stays until an ack is received. You can leverage the loading states as well to toggle entire containers for a happy medium between traditional optimistic and instant user feedback.