Using the Joomla! fields the administrator can add some information to each article he or she posts to a website (iike start & end date, start & end time, location & description, reminders). When the fields are filled a dropdown appears in the frontend allowing the visitors to add the events to calendars. When using Google they will be prompted (from time to time) to give permission for the app to manage the calendars - that action takes a few seconds seconds longer and it's the most consuming part of the interaction.