Full-disk encryption, as useful as it is, also makes this a royal pain. Updates can't be performed unattended, because each restart done during the updates requires providing the password before continuing.
I honestly thought the same and kind of just gave up the idea of hitting that at night and being done.
Figured having 4 OS installations was already fairly niche that it was largely a self imposed issue. Looking forward to confirming that this fixes the issue in my use case.