Hi Neo...
I am certainly getting a little cheesed off with Apple's attitude; their latest incarnation...
This has nailed the coffin lid on Apple for me now, I will not be buying another Apple item:
Apple locks new iPhone batteries to prevent third-party repair, report says | Ars Technica
This, along with, the hardware interface added between MOBO and HDD to make the FORCED? encrypted DRIVE impossible to read from or write to from an external live linux boot source.
This addition supposedly makes it _impossible_ to install another OS on an external drive, let alone the internal one.
Not quite true there is a back door and this current MBP with its builtin HW add-on I have been able to fool it.
I still can't read or write to the internal drive but I run this current full install Linux mint 19 on it without any problems from both USB stick and this current external HDD...
EDIT:
I have 2 MBPs, 1 iMac, and 1 iPad...