Re: the precedent this sets if a manufacturer can
It sounds like that's pretty much what they're doing - disabling the charge function.
So I guess they'll probably continue to work when plugged into a suitable PSU.
As to "update bricking it in a dangerous situation" - don't be silly. Phone firmware updates only get applied automatically when on WiFi and plugged into power, overnight (phone time)
You can only get an update to happen up a rockface if you deliberately started it!