Thanks @DiZoE for your reply!
I'll take your questions one-by-one (all of which are great, by the way!).
The following apps have requested access to Accessibility, and here are some that I've granted permission to:
- Dropbox:
Dropbox states the following
Accessibility is an Apple setting that allows applications on your Mac to interact with other applications. For example, it allows the Dropbox badge to work in non-Dropbox applications.
If you don’t turn on accessibility, you won’t get access to Dropbox features like:
- The Dropbox badge
- Seeing who’s viewed your files
- Better prioritization for file syncing
- SoundSource (by Rogue Amoeba, a trusted, long-time Mac developer and which does not require Full Disk Access):
Rogue Amoeba states the following
In MacOS 10.14 (Mojave) and higher, SoundSource needs access to MacOS's Accessibility setting to provide Super Volume Keys volume control. This page <https://rogueamoeba.com/support/knowledgebase/?showArticle=SoundSource-Privacy-Accessibility> provides further details on ensuring that access is provided, so volume keys can work as expected.
- TeamViewer: Because it is used to control a Mac. I keep this unchecked unless I expressly need it to operate for some reason.
The following apps have been granted Full Disk Access:
- Dropbox.
- Carbon Copy Cloner.
- Malwarebytes.
(It makes sense that these apps would require Full Disk Access in order to operate as advertised.)
I do not have any profiles on my Macs (except for my work Mac which is managed by them).
And no surprises with regard to Login Items, which include:
- CCC User Agent (Carbon Copy Cloner).
- OneDrive.
- SoundSource (Rogue Amoeba)
- Cookie (Mac developer SweetP Productions).
All the apps that I've granted permissions have stated reasons for doing so — except, it seems, for Apple and the Messages app.
I'm still hoping to track down the reason for the request, even if I end up denying Messages access.
Thanks again!!