Here we try to understand why the About Activity Plugin is special. It is not something I fully understand. We try to get clarity by putting this in writing.
The Activity Plugin is treated specially in that unlike other plugins it is not included in the Factory. This makes it considerably more complicated for an author to create pages with this plugin - see Creating an Activity Page.
# Thoughts on why...
There is certainly no technical reason for not adding the Activity Plugin to the Factory - it is trivial to do. There must therefore be a good reason for making it hard for an author to add an activity plugin to their page. Below we try to second guess the reasons for this:
1. We seek to encourage a standard approach to Recent Changes? 1. The Activity Plugin is considered and advance feature? 1. Other?
# See also - Creating an Activity Page