There's 2 things that I think are conflated here:

1. When Apple first switched from kexts to the network framework for apps like LittleSnitch, they exempted a ton of their own system processes (things like the App Store, and iCloud) from flowing through that framework. This change was reverted shortly after (I believe even before the GA release of that version, but don't quote me on that)

2. LittleSnitch ships with a bunch of default Allow rules designed to let expected first-party things like the App Store and iCloud work. I assume this is done so that the user experience for new LS users isn't "install app, entire system comes grinding to a halt". But these rules can be disabled by the user.

I believe that's now been rolled back - at least on my machine, LS is indeed catching a lot of Apple processes.

That's what I thought but on checking, it seems they've been stripped back to a bunch of Apple domains rather than blanket permissions for daemons, etc.