Hmm and then there appears to be RTC battery backed up memory 
After reading this thread stating that flash is limited to 10,000 writes, i feel the need to perhaps spread things around a bit.
RTC memory looks good for persisting, not config data, but perhaps state data, as in after an exception/crash where you dont expect battery disconnect/drain while the device restarts…
It also appears unmanaged but without any read/write restrictions secure seems to have, Ill hope to implement core functionality that can be reused by each these memory locations…