Well @exyle
Thank You so so much for elaborating this issue regarding Basic Account Security. Yes I know about those 3 keys but did not know their perfect use you just thrown light upon it.
This is something new for me
With the master key, you can change all the other keys. Locking out any hacker and undo the power down.
You always try to bring awareness among Steemians especially the minnows and new comers who really need some guideline from the the old Steemians.
Thanks for your worth reading Blog, it cleared many confusions of mine
Stay Blessed, Steem On!