So two questions (that maybe should be different issues, even though they're related?):
1. What is the status of this module in comparison with the Calendar → module? It's hard to try and ascertain which is the "better" or more supported/actively-being-developed choice for creating a calendar on drupal projects.
2. What do the developers/maintainers of this module see as the key differences between this module and Calendar → ? Is this option better at some specific sort of implementation or does it have some features Calendar doesn't? Any guidance, even if it's only subjective observation, would be greatly appreciated!
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
I've volunteered to help clean up the FullCalendar issue queue. As part of that effort I'm closing issues open for unsupported versions of the module as "Closed (outdated)".
If this issue is still relevant for version 3.x of FullCalendar, then feel free to re-open it and update the issue version number.