On the Activity Manager there is a "Add widgets" button, which should be removed:
- first, it is not clear where the widgets are added to (to the activity manager (I thought this at first)? or to desktop or to a panel?)
- second, on panel and desktop are already buttons to add widgets.
So in short: this button is unclear and duplicate, please remove it.
This is consistent. From the add widgets dialog there is also the link to activities. The dialogs belong to each other, so this seems like a deliberate design choice.