There is some phoning home from applications, though. On top of the occasional Gatekeeper SNAFU. I like to rely on Little Snitch, and feel nervous when using a computer without it.
Google, Adobe, and Microsoft tend to be quite bad. The other ones tend to be reasonable and just check for updates every now and then. It has flagged a couple of daemons, mostly related to iCloud, but nothing very suspicious after a quick investigation.
I ask out of honest curiosity. I tinkered with LS a year ago or so, but it made me wonder just how many bad-actors are really out there.
Cheers!