[th/initrd-autoconnect-priority] initrd: generate initrd generator profiles with autoconnect-priority -100
In general, after switch root we remember the still activated profile in /run, and NetworkManager would take over the device with the same profile as before. In that case, autoconnect and autoconnect-priority doesn't matter.
Autoconnect only matters when having a device in disconnected state and not being blocked from autoconnect. For example, if you unplug and replug the cable. In that case, it does make sense to me that user-provided profiles from real-root are preferred.
To me the reasons for this change is not very strong (but neither are the reasons against it). Read the discussion on rhbz #2089707.