The Apex will brick itself just the same if you try to access it like you would a FlexSecure via GlobalPlatform, using the wrong key (i.e. not the one Fidesmo uses internally).
This behavior is implemented in hardware in the P71 chip by NXP as a security measure for the actual intended use for credit cards, passports, etc. and cannot be changed (?). I agree that it is not optimal for implants, however at this point in time we don’t have the volume to order a batch of custom chips from NXP. Best be careful with what keys you use for authentication, if you decide to change the default key.
We are exploring ways to circumvent these issues, but this is still under research.