An issue is... there is no notification if ACARS "dumps".
Post ETOPS after oceanic entry, if you don't update, you won't know.
And SATCOM can (and does) go "offline".
The next log on is a "renewal" not "initialisation".
If VHF/HF is required and not attained (as can be in an incident), what do you report ? You simply can't.
Is there an AUTO INIT issue on the B777 (all series), especially earlier series?